As suggested in post #15, I just filled a bug report on GitLab: <https://gitlab.gnome.org/GNOME/seahorse/issues/232>, however, as I have my doubts if it is really an upstream bug, as it didn't occur on Ubuntu 16.04, just on Ubuntu 18.04, and some users reported that in Debian it works.
Hope anyone will be able (and willing) to fix it. ** Bug watch added: gitlab.gnome.org/GNOME/seahorse/issues #232 https://gitlab.gnome.org/GNOME/seahorse/issues/232 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-keyring in Ubuntu. https://bugs.launchpad.net/bugs/1771880 Title: Seahorse unable to import pkcs12 certificates Status in gnome-keyring package in Ubuntu: Confirmed Status in seahorse package in Ubuntu: Confirmed Status in gnome-keyring package in Fedora: New Bug description: seahorse 3.20.0-5 / gnome-keyring 3.28.0.2-1ubuntu1.18.04.1 / Ubuntu 18.04 LTS / GNOME 3.28.1 When trying to import a certificate into seahorse/gnome-keyring on Ubuntu 18.04, seahorse GUI application shows the 'import' button greyed out, while mouse hovering the "import" button shows the message "Cannot import because there are no compatible importers". This problem doesn't occur on Ubuntu 16.04 LTS (Seahorse 3.18.0), as I've just tested on my wife's laptop, but happens in my Laptop with Ubuntu 18.04 LTS (Seahorse 3.20.0-5). Because that problem, it's not possible to digitally sign documents with LibreOffice. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-keyring/+bug/1771880/+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
