I've always found Pinta far simpler to use to crop the occasional photo under Ubuntu 16.04 but I've just found, now that I'm under Ubuntu 18.04 that I can no longer do a rectangle select as it freezes almost immediately when "pulling" the "dotted rectangle" to where I want it. I do receive a mask asking me whether I want to send the problem off to which I reply yes but is there anything I can do to make Pinta usable again?
This appears it could be a bug affecting multiple users with Pinta: https://bugs.launchpad.net/pinta/+bug/1791916
I can verify this happens on KDE as well, so it's likely not specific to those distros, here is a crash log:
https://gist.github.com/krisives/4ad0953bc483f0883dd98c834c514964
If you don't care about Pita in specific you can try Krita.
I downloaded the code from GitHub (https://github.com/PintaProject/Pinta) and installed the latest MonoDevelop (https://www.monodevelop.com/download/) and opened the
Pita.sln
file and ran it using that in a debugger in an effort to find the error, but it doesn't happen in that build - which the About dialog says is version 1.7. This could mean:You can try 1.7 using their "Daily builds PPA" here:
https://launchpad.net/~pinta-maintainers/+archive/ubuntu/pinta-daily