Package: gdebi Version: 0.9.5.7+nmu3 Followup-For: Bug #932088 This might be the same problem I encountered on a clean install of buster. In my case it turns out gdebi-gtk is dependant on package dbus-x11, but it's not listed as a dependency.
Could you try to install package dbus-x11 and see if it solves your problem? -- System Information: Debian Release: 10.2 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.19.0-6-amd64 (SMP w/4 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8) Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages gdebi depends on: ii gdebi-core 0.9.5.7+nmu3 ii gir1.2-gtk-3.0 3.24.5-1 ii gir1.2-vte-2.91 0.54.2-2 ii gnome-icon-theme 3.12.0-3 ii policykit-1 0.105-25 ii python3 3.7.3-1 ii python3-gi 3.30.4-1 Versions of packages gdebi recommends: ii libgtk2-perl 2:1.24992-1+b2 ii lintian 2.15.0 ii shared-mime-info 1.10-1 gdebi suggests no packages. -- no debconf information
