Now trying to see bugs reported by users

our script blds/bld_prepare.sh might need some additions

debian-13 is vasically same as debian just wothout 2to3 package (it was python thing).

I am not sure how to best handle this:

make new case for debian-13 or just delete 2to3 from debian section (I think our python script in guicast was python3 ready for some years)?