When there is a lot of updates, apt takes time to run. Terminating update-apt-cache doesn't end apt which holds the lock hence the LockFailedException when ubiquity tries to install langpacks or remove packages after installation.
When there is a lot of updates, apt takes time to run. Terminating update-apt-cache doesn't end apt which holds the lock hence the LockFailedException when ubiquity tries to install langpacks or remove packages after installation.