I've upgraded my Ubuntu (by means of sudo do-release-upgrade) to 18.04 LTS, but something went wrong. Now I'm able to login to Plasma only and not Ubuntu.
When I run Synaptic, it advices me that there are three damaged packages: debconf, libpango1.0-0 and ubuntu-desktop.
When I try to reinstall them, I get the message: Impossible to apply the changes. You have to repair the packages before.
If I open a terminal and run sudo apt-get -f install I get the messages: Impossible to set the block /var/lib/dpkg/lock - open and Impossible to get the block on the administration folder. Another process could take it busy.
Which steps have I do follow to repair my system?
