I had a related issue (https://bugs.launchpad.net/pinta/+bug/1720472) and updating \Mono to 5.4.1 using their PPA (http://www.mono-project.com/download/) resolved the issue.
I had a related issue (https:/ /bugs.launchpad .net/pinta/ +bug/1720472) and updating \Mono to 5.4.1 using their PPA (http:// www.mono- project. com/download/) resolved the issue.