Ubuntu fica conectando e desconectando a rede cabeada!

Eu utilizo um Ubuntu 20.04, só que quando eu estou usando o notebook a conexão de fede via cabo fica desconectando e conectando novamente em um intervalo de tempo bem curto e acaba me atrapalhando pois essa perda de conexão faz com que eu saia de aulas e reuniões online. Ja cheguei a formatar o computador para ver se resolvia o problema mas continua com o mesmo problema. Por outro lado no mesmo notebook tenho um Windows instalado em dual boot, e não tenho esse problema nele!!

Minha placa de rede é uma Qualcom Atheros AR8151 PCI-E Gigabit Ethernet Controller (NDIS 6.30)Placa de rede

vc poderia tentar usar outro serviço de gerenciamento de rede, o systemd-networkd, por exemplo
sudo systemctl disable --now NetworkManager && sudo systemctl enable --now systemd-networkd

o ruim é que vc não vai conseguir usar o ícone de rede da interface gráfica
mas se vc não usa a rede wifi “tá e boa” (se quiser usar teria que se conectar de outra forma [1])

além do mais eu só consigo imaginar essas hipóteses:
– outro serviço derrubando a rede (talvez vc tenha dois serviços de rede iguais ao que eu listei anteriormente? sudo systemctl disable --now e dar uns tabs lista todos os serviços rodando)
– drivers, talvez? existem adaptadores que são um inferno pra fazer funcionar em linux

Tive uma experiência parecida em umas placas de rede da Broadcom. Os passos a seguir ajudaram, você pode tentar.

Execute o comando sudo lshw -C network para ver detalhes da interface e driver de rede.

Veja a saída do comando e busque por driver=ALGUMACOISA

Depois execute os comandos abaixo, e veja se o uso após isso se normaliza
sudo modprobe -r ALGUMACOISA
sudo modprobe ALGUMACOISA

Se resolver, coloque estes comandos na sua inicialização do sistema (ou coloque eles em um script e coloque ele para ser executado), pode ser pela interface gráfica nos aplicativos de inicialização, ou crie/edite o arquivo em /etc/rc.local. Dentro dele coloque os comandos acima, nesse caso separe com o operador && (irá executar o segundo comando somente depois que o primeiro finalizar) e depois de permissão de executar:

sudo chmod +x /etc/rc.local

Veja os logs do sistema, o que ele te diz quando ocorre a perda de conexão.

pra ver em tempo real: sudo journalctl -f
pra ver em tempo real apenas mensagens do kernel: sudo journalctl -kf

Daí vc deixa a janela aberta e quando cair a conexão, cancela o log (Ctrl+C) e analisa as linhas ou coloca aqui pra gente poder ajudar.

1 Curtida

O terminal mostrou isso

Logs begin at Sun 2021-02-28 22:48:16 -03

mar 02 14:38:56 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating via systemd: service name=‘org.gnome.Terminal’ unit=‘gnome-terminal-server.service’ requested by ‘:1.1561’ (uid=1000 pid=40892 comm="/usr/bin/gnome-terminal.real " label=“unconfined”)
mar 02 14:38:56 fhilippe-VPCCA25FX systemd[1648]: Starting GNOME Terminal Server…
mar 02 14:38:56 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Terminal’
mar 02 14:38:56 fhilippe-VPCCA25FX systemd[1648]: Started GNOME Terminal Server.
mar 02 14:38:56 fhilippe-VPCCA25FX systemd[1648]: Started VTE child process 40906 launched by gnome-terminal-server process 40898.
mar 02 14:38:56 fhilippe-VPCCA25FX systemd[1648]: gnome-launched-x-terminal-emulator-40889.scope: Succeeded.
mar 02 14:39:06 fhilippe-VPCCA25FX sudo[40917]: pam_unix(sudo:auth): Couldn’t open /etc/securetty: Arquivo ou diretório inexistente
mar 02 14:39:08 fhilippe-VPCCA25FX sudo[40917]: pam_unix(sudo:auth): Couldn’t open /etc/securetty: Arquivo ou diretório inexistente
mar 02 14:39:08 fhilippe-VPCCA25FX sudo[40917]: fhilippe : TTY=pts/0 ; PWD=/home/fhilippe ; USER=root ; COMMAND=/usr/bin/journalctl -f
mar 02 14:39:08 fhilippe-VPCCA25FX sudo[40917]: pam_unix(sudo:session): session opened for user root by (uid=0)
mar 02 14:39:51 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.ControlCenter.SearchProvider’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:39:51 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Calculator.SearchProvider’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:39:51 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Characters.BackgroundService’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:39:51 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Gnote’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:39:51 fhilippe-VPCCA25FX nautilus[28913]: Source ID 5641 was not found when attempting to remove it
mar 02 14:39:51 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.ControlCenter.SearchProvider’
mar 02 14:39:51 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Characters.BackgroundService’
mar 02 14:39:51 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Calculator.SearchProvider’
mar 02 14:39:52 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Gnote’
mar 02 14:39:52 fhilippe-VPCCA25FX gnome-shell[1950]: Received error from D-Bus search provider gnote.desktop: Gio.DBusError: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.gnome.Shell.SearchProvider2” on object at path /org/gnome/Gnote/SearchProvider
mar 02 14:39:52 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Characters’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:39:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Characters’
mar 02 14:39:53 fhilippe-VPCCA25FX gnome-character[40974]: JS LOG: O aplicativo de caracteres foi iniciado
mar 02 14:39:54 fhilippe-VPCCA25FX gnome-character[40974]: JS LOG: O aplicativo de caracteres foi ativado
mar 02 14:40:30 fhilippe-VPCCA25FX gnome-character[40974]: JS LOG: Encerrando o aplicativo de caracteres
mar 02 14:40:36 fhilippe-VPCCA25FX rtkit-daemon[1181]: Supervising 12 threads of 6 processes of 1 users.
mar 02 14:40:36 fhilippe-VPCCA25FX rtkit-daemon[1181]: Supervising 12 threads of 6 processes of 1 users.
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.ControlCenter.SearchProvider’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Calculator.SearchProvider’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Characters.BackgroundService’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Gnote’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.ControlCenter.SearchProvider’
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Characters.BackgroundService’
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Calculator.SearchProvider’
mar 02 14:40:53 fhilippe-VPCCA25FX gnome-calculato[41051]: search-provider.vala:140: Failed to spawn Calculator: Processo filho foi terminado pelo sinal 9
mar 02 14:40:53 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Gnote’
mar 02 14:40:53 fhilippe-VPCCA25FX gnome-shell[1950]: Received error from D-Bus search provider gnote.desktop: Gio.DBusError: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface “org.gnome.Shell.SearchProvider2” on object at path /org/gnome/Gnote/SearchProvider
mar 02 14:40:55 fhilippe-VPCCA25FX gnome-software[37412]: not handling error failed for action search: bad query
mar 02 14:40:57 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Activating service name=‘org.gnome.Characters’ requested by ‘:1.47’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:40:57 fhilippe-VPCCA25FX dbus-daemon[1661]: [session uid=1000 pid=1661] Successfully activated service ‘org.gnome.Characters’
mar 02 14:40:57 fhilippe-VPCCA25FX gnome-character[41093]: JS LOG: O aplicativo de caracteres foi iniciado
mar 02 14:40:58 fhilippe-VPCCA25FX gnome-character[41093]: JS LOG: O aplicativo de caracteres foi ativado
mar 02 14:41:15 fhilippe-VPCCA25FX gnome-character[41093]: JS LOG: Encerrando o aplicativo de caracteres
mar 02 14:42:13 fhilippe-VPCCA25FX NetworkManager[851]: [1614706933.5615] manager: NetworkManager state is now CONNECTED_SITE
mar 02 14:42:13 fhilippe-VPCCA25FX NetworkManager[851]: [1614706933.5671] manager: NetworkManager state is now CONNECTED_LOCAL
mar 02 14:42:13 fhilippe-VPCCA25FX whoopsie[1116]: [14:42:13] offline
mar 02 14:42:13 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Activating via systemd: service name=‘org.freedesktop.nm_dispatcher’ unit=‘dbus-org.freedesktop.nm-dispatcher.service’ requested by ‘:1.15’ (uid=0 pid=851 comm="/usr/sbin/NetworkManager --no-daemon " label=“unconfined”)
mar 02 14:42:13 fhilippe-VPCCA25FX NetworkManager[851]: [1614706933.5678] manager: NetworkManager state is now CONNECTED_SITE
mar 02 14:42:13 fhilippe-VPCCA25FX NetworkManager[851]: [1614706933.5681] policy: set ‘SPACY-NET-FIBRA-YAHWEH’ (wlp1s0) as default for IPv4 routing and DNS
mar 02 14:42:13 fhilippe-VPCCA25FX systemd[1]: Starting Network Manager Script Dispatcher Service…
mar 02 14:42:13 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
mar 02 14:42:13 fhilippe-VPCCA25FX systemd[1]: Started Network Manager Script Dispatcher Service.
mar 02 14:42:23 fhilippe-VPCCA25FX systemd[1]: NetworkManager-dispatcher.service: Succeeded.
mar 02 14:42:32 fhilippe-VPCCA25FX firefox[7252]: gtk_widget_get_window: assertion ‘GTK_IS_WIDGET (widget)’ failed
mar 02 14:42:32 fhilippe-VPCCA25FX firefox[7252]: gtk_widget_get_window: assertion ‘GTK_IS_WIDGET (widget)’ failed
mar 02 14:42:52 fhilippe-VPCCA25FX NetworkManager[851]: [1614706972.0983] manager: NetworkManager state is now CONNECTED_GLOBAL
mar 02 14:42:52 fhilippe-VPCCA25FX NetworkManager[851]: [1614706972.1006] policy: set ‘Conexão cabeada 1’ (enp4s0) as default for IPv4 routing and DNS
mar 02 14:42:52 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Activating via systemd: service name=‘org.freedesktop.nm_dispatcher’ unit=‘dbus-org.freedesktop.nm-dispatcher.service’ requested by ‘:1.15’ (uid=0 pid=851 comm="/usr/sbin/NetworkManager --no-daemon " label=“unconfined”)
mar 02 14:42:52 fhilippe-VPCCA25FX whoopsie[1116]: [14:42:52] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/7
mar 02 14:42:52 fhilippe-VPCCA25FX whoopsie[1116]: [14:42:52] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/7
mar 02 14:42:52 fhilippe-VPCCA25FX whoopsie[1116]: [14:42:52] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/7
mar 02 14:42:52 fhilippe-VPCCA25FX systemd[1]: Starting Network Manager Script Dispatcher Service…
mar 02 14:42:52 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
mar 02 14:42:52 fhilippe-VPCCA25FX systemd[1]: Started Network Manager Script Dispatcher Service.
mar 02 14:42:53 fhilippe-VPCCA25FX whoopsie[1116]: [14:42:53] online
mar 02 14:43:02 fhilippe-VPCCA25FX systemd[1]: NetworkManager-dispatcher.service: Succeeded.
mar 02 14:45:52 fhilippe-VPCCA25FX gnome-shell[7252]: ###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost
mar 02 14:48:04 fhilippe-VPCCA25FX NetworkManager[851]: [1614707284.5611] manager: NetworkManager state is now CONNECTED_SITE
mar 02 14:48:04 fhilippe-VPCCA25FX NetworkManager[851]: [1614707284.5632] manager: NetworkManager state is now CONNECTED_LOCAL
mar 02 14:48:04 fhilippe-VPCCA25FX whoopsie[1116]: [14:48:04] offline
mar 02 14:48:04 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Activating via systemd: service name=‘org.freedesktop.nm_dispatcher’ unit=‘dbus-org.freedesktop.nm-dispatcher.service’ requested by ‘:1.15’ (uid=0 pid=851 comm="/usr/sbin/NetworkManager --no-daemon " label=“unconfined”)
mar 02 14:48:04 fhilippe-VPCCA25FX NetworkManager[851]: [1614707284.5661] manager: NetworkManager state is now CONNECTED_SITE
mar 02 14:48:04 fhilippe-VPCCA25FX NetworkManager[851]: [1614707284.5663] policy: set ‘SPACY-NET-FIBRA-YAHWEH’ (wlp1s0) as default for IPv4 routing and DNS
mar 02 14:48:04 fhilippe-VPCCA25FX systemd[1]: Starting Network Manager Script Dispatcher Service…
mar 02 14:48:04 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
mar 02 14:48:04 fhilippe-VPCCA25FX systemd[1]: Started Network Manager Script Dispatcher Service.
mar 02 14:48:14 fhilippe-VPCCA25FX systemd[1]: NetworkManager-dispatcher.service: Succeeded.
mar 02 14:48:35 fhilippe-VPCCA25FX NetworkManager[851]: [1614707315.1377] manager: NetworkManager state is now CONNECTED_GLOBAL
mar 02 14:48:35 fhilippe-VPCCA25FX NetworkManager[851]: [1614707315.1450] policy: set ‘Conexão cabeada 1’ (enp4s0) as default for IPv4 routing and DNS
mar 02 14:48:35 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Activating via systemd: service name=‘org.freedesktop.nm_dispatcher’ unit=‘dbus-org.freedesktop.nm-dispatcher.service’ requested by ‘:1.15’ (uid=0 pid=851 comm="/usr/sbin/NetworkManager --no-daemon " label=“unconfined”)
mar 02 14:48:35 fhilippe-VPCCA25FX systemd[1]: Starting Network Manager Script Dispatcher Service…
mar 02 14:48:35 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
mar 02 14:48:35 fhilippe-VPCCA25FX systemd[1]: Started Network Manager Script Dispatcher Service.
mar 02 14:48:35 fhilippe-VPCCA25FX whoopsie[1116]: [14:48:35] The default IPv4 route is: /org/freedesktop/NetworkManager/ActiveConnection/7
mar 02 14:48:35 fhilippe-VPCCA25FX whoopsie[1116]: [14:48:35] Not a paid data plan: /org/freedesktop/NetworkManager/ActiveConnection/7
mar 02 14:48:35 fhilippe-VPCCA25FX whoopsie[1116]: [14:48:35] Found usable connection: /org/freedesktop/NetworkManager/ActiveConnection/7
mar 02 14:48:36 fhilippe-VPCCA25FX whoopsie[1116]: [14:48:36] online
mar 02 14:48:45 fhilippe-VPCCA25FX systemd[1]: NetworkManager-dispatcher.service: Succeeded.
mar 02 14:53:39 fhilippe-VPCCA25FX NetworkManager[851]: [1614707619.5621] manager: NetworkManager state is now CONNECTED_SITE
mar 02 14:53:39 fhilippe-VPCCA25FX NetworkManager[851]: [1614707619.5654] manager: NetworkManager state is now CONNECTED_LOCAL
mar 02 14:53:39 fhilippe-VPCCA25FX whoopsie[1116]: [14:53:39] offline
mar 02 14:53:39 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Activating via systemd: service name=‘org.freedesktop.nm_dispatcher’ unit=‘dbus-org.freedesktop.nm-dispatcher.service’ requested by ‘:1.15’ (uid=0 pid=851 comm="/usr/sbin/NetworkManager --no-daemon " label=“unconfined”)
mar 02 14:53:39 fhilippe-VPCCA25FX NetworkManager[851]: [1614707619.5694] manager: NetworkManager state is now CONNECTED_SITE
mar 02 14:53:39 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
mar 02 14:53:39 fhilippe-VPCCA25FX NetworkManager[851]: [1614707619.5697] policy: set ‘SPACY-NET-FIBRA-YAHWEH’ (wlp1s0) as default for IPv4 routing and DNS
mar 02 14:53:39 fhilippe-VPCCA25FX systemd[1]: Starting Network Manager Script Dispatcher Service…
mar 02 14:53:39 fhilippe-VPCCA25FX systemd[1]: Started Network Manager Script Dispatcher Service.
mar 02 14:53:49 fhilippe-VPCCA25FX systemd[1]: NetworkManager-dispatcher.service: Succeeded.
mar 02 14:53:52 fhilippe-VPCCA25FX gnome-shell[1950]: _shell_embedded_window_unmap: assertion ‘SHELL_IS_EMBEDDED_WINDOW (window)’ failed
mar 02 14:53:53 fhilippe-VPCCA25FX gnome-shell[1950]: …/…/…/gobject/gsignal.c:2735: instance ‘0x7f45ac0135c0’ has no handler with id ‘682101’
mar 02 14:53:53 fhilippe-VPCCA25FX gnome-shell[1950]: …/…/…/gobject/gsignal.c:2735: instance ‘0x7f45ac0135c0’ has no handler with id ‘682102’
mar 02 14:53:53 fhilippe-VPCCA25FX gnome-shell[1950]: …/…/…/gobject/gsignal.c:2735: instance ‘0x5631fd9b4020’ has no handler with id ‘682097’
mar 02 14:53:53 fhilippe-VPCCA25FX gnome-shell[1950]: …/…/…/gobject/gsignal.c:2735: instance ‘0x5631fd9b4020’ has no handler with id ‘682098’
mar 02 14:53:53 fhilippe-VPCCA25FX gnome-shell[1950]: …/…/…/gobject/gsignal.c:2735: instance ‘0x5631fd9b4020’ has no handler with id ‘682099’
mar 02 14:53:53 fhilippe-VPCCA25FX gnome-shell[1950]: Could not create transient scope for PID 41498: GDBus.Error:org.freedesktop.DBus.Error.UnixProcessIdUnknown: Process with ID 41498 does not exist.
mar 02 14:53:53 fhilippe-VPCCA25FX gnome-shell[1950]: Could not create transient scope for PID 41499: GDBus.Error:org.freedesktop.DBus.Error.UnixProcessIdUnknown: Process with ID 41499 does not exist.
mar 02 14:54:28 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Activating via systemd: service name=‘net.reactivated.Fprint’ unit=‘fprintd.service’ requested by ‘:1.170’ (uid=1000 pid=1950 comm="/usr/bin/gnome-shell " label=“unconfined”)
mar 02 14:54:28 fhilippe-VPCCA25FX systemd[1]: Starting Fingerprint Authentication Daemon…
mar 02 14:54:28 fhilippe-VPCCA25FX dbus-daemon[850]: [system] Successfully activated service ‘net.reactivated.Fprint’
mar 02 14:54:28 fhilippe-VPCCA25FX systemd[1]: Started Fingerprint Authentication Daemon.
mar 02 14:54:28 fhilippe-VPCCA25FX gdm-password][41518]: pam_unix(gdm-password:auth): Couldn’t open /etc/securetty: Arquivo ou diretório inexistente
mar 02 14:54:32 fhilippe-VPCCA25FX gdm-password][41518]: pam_unix(gdm-password:auth): Couldn’t open /etc/securetty: Arquivo ou diretório inexistente
mar 02 14:54:32 fhilippe-VPCCA25FX gdm-password][41518]: gkr-pam: unlocked login keyring
mar 02 14:54:32 fhilippe-VPCCA25FX NetworkManager[851]: [1614707672.7769] agent-manager: agent[5ad89940b6d8c60f,:1.170/org.gnome.Shell.NetworkAgent/1000]: agent registered
mar 02 14:54:33 fhilippe-VPCCA25FX gnome-shell[1950]: loading user theme: /home/fhilippe/.themes/WhiteSur-dark/gnome-shell/gnome-shell.css
mar 02 14:54:33 fhilippe-VPCCA25FX gnome-shell[1950]: Ignoring length property that isn’t a number at line 3146, col 24
mar 02 14:54:33 fhilippe-VPCCA25FX gnome-shell[1950]: Ignoring length property that isn’t a number at line 3146, col 24
mar 02 14:54:33 fhilippe-VPCCA25FX gnome-shell[1950]: Ignoring length property that isn’t a number at line 3146, col 24

eu executei os comando e continuou caindo

Estou desconfiado que quando o network manager detecta a rede wifi, ele derruba a rede cabeada.

Poderia tentar desativar o wifi e usar apenas o cabo?

vou fazer e deixar o terminal rodando os logs do sistema

Conseguiu solucionar?
Estou com o mesmo problema no Kubuntu.

pode ser o cabo…

qual o cabo que está utilizando cat5e , cat6 ,cat7…?

sua conexão é GB e por causa do cabo conecta como MB ocasionando assim a desconexão

Eu desativei o wifi e esta funcionando sem nehuma interrupção.

Muito obrigada @Deleterium !!