severity 853016 grave
thanks
In fact, you terminate the window the aptitude upgrade was running.
The next time the user runs apt/aptitude, he will be met with
E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct
the problem.
W: Could not lock the cache file; this usually means that dpkg or another apt
tool is already installing packages. Opening in read-only mode; any changes
you make to the states of packages will NOT be preserved!
E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct
the problem.