Did you reinstall gdebi-core? It contains the mo files. Here is my test results with hu_HU.UTF8 locale and the PPA version of gdebi:
debi-kde --help Usage: gdebi-kde [options] Options: -h, --help show this help message and exit -n, --non-interactive Futtatás nem interaktív módban (veszélyes!) -- gdebi-kde βετα/gnome-app-install_0.5.12-0ubuntu1_all.deb executable /usr/bin/gdebi-kde No error window or any problem. So please try reinstall the gdebi-core. -- [kde] Applications cannot read Greek folder names https://bugs.launchpad.net/bugs/190907 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs