I upgraded Ubuntu 16.04.7 LTS → Ubuntu 20.04.2 LTS. Now I’m having a problem with starting unifi controller.
I get this…
unifi unifi[9440]: 2021-04-27 14:44:24,643 main ERROR Error processing element InMemoryAppender ([Appenders: null]): CLASS_NOT_FO…
unifi unifi[9440]: 2021-04-27 14:44:25,307 main ERROR Unable to locate appender “InMemoryAppender” for logger config “root”…