Hi everyone, I encountered the same issue when using GNOME Papers' "Sign Digitally" feature. The signing process fails due to AppArmor restrictions that prevent access to certain required directories.
I reported this issue on Ubuntu Launchpad (bug #2106133) and confirmed that adjusting the AppArmor profile resolves the problem: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/2106133 AppArmor currently blocks GNOME Papers from accessing: ~/.pki/nssdb /sys/devices/ and /run/pcscd/pcscd.comm After adding the following lines to the file `/etc/apparmor.d/usr.bin.papers` and reloading AppArmor, digital signing works correctly: owner @{HOME}/.pki/** lrk, /sys/devices/** r, /run/pcscd/pcscd.comm rw, This indicates that the issue lies in the AppArmor profile rather than in the Papers application itself. Dear maintainers, please consider reassigning this bug to the 'apparmor' package. Best regards, Cristiano Fraga G. Nunes
