After the backup I did: sudo sed -i 's/belenos/flidas/' /etc/apt/sources.list
and then: sudo apt update
I get this now.
user@user-ThinkPad-X200:~$ sudo apt update
[sudo] password for user:
/usr/lib/apt/methods/https: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version
`GLIBCXX_3.4.20' not found (required by /usr/lib/apt/methods/https)
E: Method https has died unexpectedly!
E: Sub-process https returned an error code (1)
E: Method /usr/lib/apt/methods/https did not start correctly
It could be that I already tried to install https before.
