Problem solved:
Booting the Ubuntu system the timedate service didn't work (bug?). The
date was one year behind. Therefore some certificates failed and thus
some connections to repositories.
I changed timedate to ntp and all works fine!
$ sudo timedatectl set-ntp no
$ sudo apt install ntp
** Project changed: canonical-identity-provider => openjdk-11 (Ubuntu)
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https://bugs.launchpad.net/bugs/1920611
Title:
ubuntu-20.04.2 for raspberry, java installation fails
To manage n