as @karel wrote easiest and short way is backing up date and make clean install.
For a little adventure you can try to end your release upgrade the debian way.
Save your data and make a working install media (I would say with jammy).
Replace your /etc/apt/sources.list and make a new one with following content
deb http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
deb http://archive.canonical.com/ubuntu focal partner
Move any file under /etc/apt/sources.list.d/ in a folder in your $HOME
When create following files:
/etc/apt/preferences.d/focal.pref with content
Pin: release n=focal
This forces apt to install packages from focal sources even a newer version from foreign sources are on your system; thats why it is so important to replace the sources.list und move any file under /etc/apt/sources.list.d/ away.
The next file to create
So this for me annoying feature is not disturbing us.
And the last file to create
# Heruntergeladene Pakete behalten.
So downloaded packages will stay in /var/cache/apt/archives/
sudo apt-get clean && sudo apt-get autoclean
This is removes any old and/or only partial downloaded packages in /var/cache/apt/archives
Check out for free space and inodes
df -h;df -i
and free space and inodes if it is required
sudo apt-get update && sudo apt-get -f install && sudo apt-get upgrade
If here to many errors break up and install new.
sudo apt-get dist-upgrade
Then you can remove /etc/apt/preferences.d/focal.pref and the 2 created files under /etc/apt/apt.conf.d/
The one message on your image is strange:
An upgrade from focal to bionic is not supported with this tool.
Did you try somehow go back to bionic?