Whenever I want to install matplotlib on my laptop I get a reply like

libpam-systemd : Depends: systemd (= 229-4ubuntu21.6)
systemd : Depends: libsystemd0 (= 229-4ubuntu21.5) but 229-4ubuntu21.6 is installed.

I don't know how to fix this. The sudo spt upgrade command is also not working due to this problem.

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