I'm trying to install Jenkins plugins with jenkins-plugin-manager, it appears to work, because the plugins are in the $JENKINS_HOME/plugins folder (*.jpi), but I don't see any plugins installed in the Jenkins UI. I've tried to restart Jenkins throght UI, but it didn't work.
Apparently restart throught UI somehow doesn't work here. I've restartet jenkins docker container (or docker service) and now I see the installed plugins in the UI.