univention-install calls apt-get with the following arguments: -o DPkg::Options::=--force-overwrite -o DPkg::Options::=--force-overwrite-dir In case of a file or directory conflict, apt-get is forced to overwrite existing versions. The current version of the app center throws an error if a conflict occurs. We should align the behaviour of both tools.
Would not be anymore relevant when Bug #40064 is fixed. *** This bug has been marked as a duplicate of bug 40064 ***