I just wanted to update this thread and indicate that this solution will also fix the same error message, which occurred when I updated from Ubuntu 18.04 to Ubuntu 20.04.efhalo wrote:The workaround: del key files from: /home/USER/.config/deluge/ssl/
General support for problems installing or using Deluge
Fixed issue for me too (issue appeared after upgrade of raspbian from jessie to buster). The files I had inreukiodo wrote:This worked for me, although I had a LOT of daemon.cert and daemon.pkey files everywhere:efhalo wrote:The workaround: del key files from: /home/USER/.config/deluge/ssl/
also needed deleting.