Doesn't work with ubuntu 20.04

[ShizuhaAki]

It says that some packages depended are deprecated.

[HappyCampero76]

Hi i have an error by launching the settings :check & adapt.
Error = mousepad:571442:GtkSourceView-WARNING : could not load the style scheme file /usr/share/gtksourceview-3.0/styles/backbox-light.xml.No such a file or directory....
Same goes for a second message the only thing different is: backbox-dark.xml
OS BackBox-7 "based on Ubuntu 20.04" released on on May 2020...
Question how do i fix it?,how can i generate the backbox-light.xml and backbox-dark.xml?
Reason why i cannot use the GUI right after i save the .txt file and close it,the terminal windows along with the .txt disappear....<<<<< WRONG STATEMENT!!!...

Correcting my previous statement.. the files are there but for some reasons when i launch the application those 2 files won't get loaded...
So how do i fix it?