gscan2pdf error message on startup?

[valtam]

You don't need a PPA, gscan2pdf is already available in 4.x

Uninstall the program, remove the PPA as per the Help Manual instructions.

Then:

Code:

apt policy gscan2pdf

should return something like:

Code:

gscan2pdf:
  Installed: (none)
  Candidate: 2.1.0-1
  Version table:
     2.1.0-1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages

if the version info is the same as above, then:

Code:

sudo apt-get install gscan2pdf

and in future, consult the Forums before adding PPA's, they are complicated. Cheers