Frederik ElwertSince our university ditched both Adobe and Master PDF, and the new PDF solution is not available for #Ubuntu #Linux, I was looking for a viable PDF signing solution. It appears that the new #GNOMEPapers app actually supports this! With caveats … 1/
The first issue was getting Papers to find my certificates. After digging in the Poppler source code, I found that they hard-code the path they check as '$HOME/.mozilla/firefox'. But Ubuntu ships the #snap version of Firefox, which uses '$HOME/snap/firefox/common'. Could solve this by soft linking the snap profile dir to the expected one. (Just copying cert9.db and key4.db also worked.) Now I can sign! 2/
But Papers itself shows a warning that the signature is not valid. Still have to find out why. It doesn’t tell much, unfortunately. Using other checkers, it might be that it either cannot establish the certificate path (unknown root cert), and/or that the 'signing-time' property is missing. 3/3