My PC has:
-side library
ii openssh-client 1:9.6p1-3ubuntu13.8 amd64 secure shell (SSH) client, for secure access to remote machines
ii openssh-server 1:9.6p1-3ubuntu13.8 amd64 secure shell (SSH) server, for secure access from remote machines
ii openssh-sftp-server 1:9.6p1-3ubuntu13.8 amd64 secure shell (SSH) sftp server module, for SFTP access from remote machines
I meant the other methioned thread.
I used the webbrowser to upgrade, so there are solutions of course. Thanks for explaining, I didn't know this. There is no problem to connect via ssh and keys.