Thanks @vesper1978 for recommending the logs, they do indeed point to the problem:
After a quick search on the forum, I would recommend the following thread and the post below in particular:
It does look like an error may have occurred during the update of the samba package (there have been quite a lot of them lately from upstream). I would thus try to follow @phillxnet’s suggestions in the post linked above and it should help move things further.