Debian gui app to rename multiple files...

I have found "Bulk rename" utility that is part of linux package "thunar" as most simple bulk renamer that does all important basic operations like prefix/suffix, numbering, replacement, date, lower/upper case conversion.



Other option in Debian and likely other Linux is GUI tool krename. It requires more time to do the task and not so easily like thunar tool, yet krename is a bit more advanced.