I've downloaded guitarpro from torrent and it was missing some dependencies.
When I did sudo apt-get install -f after it did it's job, I saw at the end that it was trying to delete the sudoers file also, but I didn't have that privilege (luckily) for that. Be careful what you download and install from torrents. If this helps, I've also scanned guitarpro package with clamav, and the clamscan was negative for viruses. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to sudo in Ubuntu. https://bugs.launchpad.net/bugs/1514165 Title: package sudo 1.8.12-1ubuntu3 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1 Status in sudo package in Ubuntu: Invalid Bug description: This happened after doing apt-get check and I was recommended to run apt-get -f install ProblemType: Package DistroRelease: Ubuntu 15.10 Package: sudo 1.8.12-1ubuntu3 ProcVersionSignature: Ubuntu 4.2.0-16.19-lowlatency 4.2.3 Uname: Linux 4.2.0-16-lowlatency x86_64 ApportVersion: 2.19.1-0ubuntu3 Architecture: amd64 Date: Sun Nov 8 04:45:37 2015 DpkgHistoryLog: Start-Date: 2015-11-08 04:45:36 Commandline: apt-get -f install Install: libportaudio2:i386 (19+svn20140130-1build1, automatic) Remove: sudo:amd64 (1.8.12-1ubuntu3), ubuntu-minimal:amd64 (1.341), guitarpro6:i386 (6.1.9) DuplicateSignature: package:sudo:1.8.12-1ubuntu3:subprocess installed pre-removal script returned error exit status 1 ErrorMessage: subprocess installed pre-removal script returned error exit status 1 InstallationDate: Installed on 2015-10-23 (15 days ago) InstallationMedia: Ubuntu-Studio 15.10 "Wily Werewolf" - Release amd64 (20151021) RelatedPackageVersions: dpkg 1.18.2ubuntu5 apt 1.0.10.2ubuntu1 SourcePackage: sudo Title: package sudo 1.8.12-1ubuntu3 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1 UpgradeStatus: No upgrade log present (probably fresh install) VisudoCheck: /etc/sudoers: parsed OK /etc/sudoers.d/README: parsed OK To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/1514165/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp