There is a error into the /usr/share/polkit-1/actions/com.ubuntu.pkexec .gdebi-gtk.policy file:
Change "<action id="com.ubuntu.pkexec.gdebi.gtk">" with "<action id="com.ubuntu.pkexec.gdebi-gtk">". -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to vte2.91 in Ubuntu. https://bugs.launchpad.net/bugs/1756238 Title: gdebi-gtk broken in 18.04 error: unable to read filedescriptor flags Status in gdebi package in Ubuntu: Triaged Status in vte2.91 package in Ubuntu: Fix Released Status in vte2.91 source package in Bionic: Fix Released Bug description: When using gdebi-gtk to install a .deb the install fails with the message:- dpkg: error: unable to read filedescriptor flags for <package status and progress file descriptor>: Bad file descriptor This only occurs via the gdebi-gtk GUI front end, packages install perfectly if done via the CLI with: sudo gdebi /path/to/packagename.deb To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdebi/+bug/1756238/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp