Ergänzung: In der Kopfzeile steht seitdem ein rundes, rotes Zeichen mit einem weißen Querbalken. Beim Anklicken kommt die Aufforderung die Paketverwaltung über Kontextmenü zu starten oder apt-get auszuführen, ... class 'apt_pkg.Error' ...
Außerdem möchte Ubuntu ständig ein Problem nach Hause senden.
Alo bitte gerne, wenns hilft, hier die Ausgaben
:
user@user-ESPRIMO-E720:~$ sudo cat /etc/apt/sources.list
[sudo] Passwort für user:
deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
# deb-src http://de.archive.ubuntu.com/ubuntu/ focal main restricted
## Major bug fix updates produced after the final release of the
## distribution.
# deb-src http://de.archive.ubuntu.com/ubuntu/ focal-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-src http://de.archive.ubuntu.com/ubuntu/ focal universe
# deb-src http://de.archive.ubuntu.com/ubuntu/ focal-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-src http://de.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://de.archive.ubuntu.com/ubuntu/ focal-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-src http://de.archive.ubuntu.com/ubuntu/ focal-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 focal partner
# deb-src http://archive.canonical.com/ubuntu focal partner
# deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu focal-security universe
# deb-src http://security.ubuntu.com/ubuntu focal-security multiverse
deb http://archive.ubuntu.com/ubuntu focal main restricted
.
user@user-ESPRIMO-E720:~$ grep -P '^[ \t]*[^#[ \t]+' /etc/apt/sources.list /etc/apt/sources.list.d/*.list
/etc/apt/sources.list:deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main restricted
/etc/apt/sources.list:deb http://archive.ubuntu.com/ubuntu focal main restricted
grep: /etc/apt/sources.list.d/*.list: Datei oder Verzeichnis nicht gefunden
@voxxell99: Danke für die Belehrung. Ich kann da nicht so genau unterscheiden.