Problemas constantes com repositórios no Xubuntu

Vários repositórios que venho tentando instalar eles meio que dão erro, e isso impede que eu adicione outras e que eles funcionem corretamente. E as vezes se eu removo o repositório com problema, outros acabam dando problema e por aí vai…

E: The repository ‘http://ppa.launchpad.net/rebuntu16/other-stuff/ubuntu disco Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Pode me contar quais repositórios estão com problema? Quais pacotes dão problema quando você remove o repositório?

Aí que tá, até agora tem o xfce theme manager, do arc theme, e outros que tinha dado problema e eu tirei.

Antes de mais anda, poste ai o seu sorces list para gente ver como está. Se quiser é só usar um

cat /etc/apt/sources.list

Tem muito tempo que não uso o Ubuntu, porém, já vi esse erro acontecer mais de uma vez quando se usa diferentes fontes nos repositórios. Por exemplo, usar repositórios que remetem a versões mais antigas do Ubuntu.

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Seria isso?


deb cdrom:[Xubuntu 19.04 Disco Dingo - Release amd64 (20190416)]/ disco main multiverse restricted universe

See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
newer versions of the distribution.
deb Index of /ubuntu disco main restricted
deb-src Index of /ubuntu disco main restricted

Major bug fix updates produced after the final release of the
distribution.
deb Index of /ubuntu disco-updates main restricted
deb-src Index of /ubuntu disco-updates main restricted

N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
team. Also, please note that software in universe WILL NOT receive any
review or updates from the Ubuntu security team.
deb Index of /ubuntu disco universe
deb-src Index of /ubuntu disco universe
deb Index of /ubuntu disco-updates universe
deb-src Index of /ubuntu disco-updates universe

N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
team, and may not be under a free licence. Please satisfy yourself as to
your rights to use the software. Also, please note that software in
multiverse WILL NOT receive any review or updates from the Ubuntu
security team.
deb Index of /ubuntu disco multiverse
deb-src Index of /ubuntu disco multiverse
deb Index of /ubuntu disco-updates multiverse
deb-src Index of /ubuntu disco-updates multiverse

N.B. software from this repository may not have been tested as
extensively as that contained in the main release, although it includes
newer versions of some applications which may provide useful features.
Also, please note that software in backports WILL NOT receive any review
or updates from the Ubuntu security team.
deb Index of /ubuntu disco-backports main restricted universe multiverse
deb-src Index of /ubuntu disco-backports main restricted universe multiverse

Uncomment the following two lines to add software from Canonical’s
‘partner’ repository.
This software is not part of Ubuntu, but is offered by Canonical and the
respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu disco partner
deb-src http://archive.canonical.com/ubuntu disco partner

deb http://security.ubuntu.com/ubuntu disco-security main restricted
deb-src http://security.ubuntu.com/ubuntu disco-security main restricted
deb http://security.ubuntu.com/ubuntu disco-security universe
deb-src http://security.ubuntu.com/ubuntu disco-security universe
deb http://security.ubuntu.com/ubuntu disco-security multiverse
deb-src http://security.ubuntu.com/ubuntu disco-security multiverse

This system was installed using small removable media
(e.g. netinst, live or single CD). The matching “deb cdrom”
entries were disabled at the end of the installation process.
For information about how to configure apt package sources,
see the sources.list(5) manual.

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