from my auth.log file: before modifying the terminal flag in gdebi.desktop
Jul 8 15:20:46 johndoe-Latitude-D630 polkitd(authority=local): Operator of unix-session:c2 FAILED to authenticate to gain authorization for action com.ubuntu.pkexec.gdebi.gtk for unix-process:998:23188 [/lib/systemd/systemd --user] (owned by unix-user:johndoe) Jul 8 15:20:46 johndoe-Latitude-D630 pkexec[4230]: johndoe: Error executing command as another user: Request dismissed [USER=root] [TTY=unknown] [CWD=/home/johndoe/tmp] [COMMAND=/usr/bin/gdebi-gtk --non- interactive /home/johndoe/tmp/mozilla_johndoe0/ghex_3.18.3-3_amd64.deb] after modifying the terminal flag in gdebi.desktop Jul 8 15:35:26 johndoe-Latitude-D630 polkitd(authority=local): Operator of unix-session:c2 successfully authenticated as unix-user:johndoe to gain ONE-SHOT authorization for action com.ubuntu.pkexec.gdebi.gtk for unix-process:5533:234898 [/usr/lib/firefox/firefox] (owned by unix-user:johndoe) Jul 8 15:35:26 johndoe-Latitude-D630 pkexec: pam_unix(polkit-1:session): session opened for user root by (uid=1000) Jul 8 15:35:26 johndoe-Latitude-D630 pkexec[5699]: johndoe: Executing command [USER=root] [TTY=unknown] [CWD=/home/johndoe] [COMMAND=/usr/bin /gdebi-gtk --non-interactive /home/johndoe/tmp/mozilla_johndoe0/ghex_3.18.3-3_amd64.deb] -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gdebi in Ubuntu. https://bugs.launchpad.net/bugs/1749728 Title: Installing packages fails when launched via Firefox ("open with") Status in gdebi package in Ubuntu: Confirmed Bug description: When launched from Firefox with the "open with" function, GDebi is unable to complete installing the package. The GDebi window does open, but after selecting to "install" the package the window closes and the package is left uninstalled. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gdebi 0.9.5.7+nmu2 ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13 Uname: Linux 4.13.0-32-generic x86_64 ApportVersion: 2.20.8-0ubuntu10 Architecture: amd64 CurrentDesktop: MATE Date: Thu Feb 15 17:08:31 2018 InstallationDate: Installed on 2018-02-15 (0 days ago) InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180215) PackageArchitecture: all SourcePackage: gdebi UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdebi/+bug/1749728/+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