I am trying to sign letters with digital signature, when I open File>Digital Signatures> Digital Signature I get an empty Digital Signature window and when I click the Start Certificate Manager… I get an error window saying “Could not find any certificate manager.” Where is the Certificate Manager? What should I do?
Sorry for not giving my OS: I use Ubuntu20.04.2LTS
Many thanks for the help.
Addition. Yes I have gnupg and a key but how am I going to put it in certificate manager?
Sorry for bothering you, but I installed kgpg and nothing happened. Still when I want to sign a LO writer doc I get empty digital signatures window and certificate manager can not be found.