I upgraded Ubuntu from 20.04LTS to 22.04LTS and now my Ubuntu Software GUI is not working anymore it is not opening at all. I have googled the entire internet and nothing works. I removed and installed gnome-software. When I tried sudo apt install --reinstall software-center it gave me the error: package software center has no installation candidate. What does that even mean? What can I do to use my Software Center again?
EDIT:
The command cat /etc/apt/sources.list outputs the following:
jan@Ubuntu-20-04:~$ cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 20.04.2.0 LTS _Focal Fossa_ - Release amd64 (20210209.1)]/ focal main restricted
See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
newer versions of the distribution.
deb http://nl.archive.ubuntu.com/ubuntu/ jammy main restricted
deb-src http://nl.archive.ubuntu.com/ubuntu/ focal main restricted
Major bug fix updates produced after the final release of the
distribution.
deb http://nl.archive.ubuntu.com/ubuntu/ jammy-updates main restricted
deb-src http://nl.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 http://nl.archive.ubuntu.com/ubuntu/ jammy universe
deb-src http://nl.archive.ubuntu.com/ubuntu/ focal universe
deb http://nl.archive.ubuntu.com/ubuntu/ jammy-updates universe
deb-src http://nl.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 http://nl.archive.ubuntu.com/ubuntu/ jammy multiverse
deb-src http://nl.archive.ubuntu.com/ubuntu/ focal multiverse
deb http://nl.archive.ubuntu.com/ubuntu/ jammy-updates multiverse
deb-src http://nl.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 http://nl.archive.ubuntu.com/ubuntu/ jammy-backports main restricted universe multiverse
deb-src http://nl.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu jammy-security main restricted
deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://security.ubuntu.com/ubuntu jammy-security universe
deb-src http://security.ubuntu.com/ubuntu focal-security universe
deb http://security.ubuntu.com/ubuntu jammy-security multiverse
deb-src http://security.ubuntu.com/ubuntu focal-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.
deb [arch=amd64] https://download.docker.com/linux/ubuntu jammy stable # uitgeschakeld bij opwaardering naar jammy
deb-src [arch=amd64] https://download.docker.com/linux/ubuntu focal stable
SECOND EDIT:
jan@Ubuntu-20-04:~$ sudo apt update
[sudo] wachtwoord voor jan:
Geraakt:1 http://nl.archive.ubuntu.com/ubuntu jammy InRelease
Ophalen:2 http://security.ubuntu.com/ubuntu jammy-security InRelease [110 kB]
Geraakt:3 http://nl.archive.ubuntu.com/ubuntu jammy-updates InRelease
Geraakt:4 http://nl.archive.ubuntu.com/ubuntu jammy-backports InRelease
Geraakt:5 https://ppa.launchpadcontent.net/deadsnakes/ppa/ubuntu jammy InRelease
110 kB opgehaald in 2s (54,3 kB/s)
Pakketlijsten worden ingelezen... Klaar
Boom van vereisten wordt opgebouwd... Klaar
De statusinformatie wordt gelezen... Klaar
Alle pakketten zijn up-to-date.
