After closing the previously reported error window, installation carried on for a further 40 or so minutes, and then finally failed with a similar error message:
Could not install the upgrades
The upgrade aborts now. Your system could be in an unusable state. A recovery was run (dpkg --configure -a).
Please report this bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bugreport.
After closing the previously reported error window, installation carried on for a further 40 or so minutes, and then finally failed with a similar error message:
Could not install the upgrades
The upgrade aborts now. Your system could be in an unusable state. A recovery was run (dpkg --configure -a).
Please report this bug against the 'update-manager' package and include the files in /var/log/ dist-upgrade/ in the bugreport.
installArchives() failed