See https://askubuntu.com/questions/1098414/18-04-unable-to-connect-to-server-due-to-temporary-failure-in-name-resolution/1099311 for workaround.
See https:/ /askubuntu. com/questions/ 1098414/ 18-04-unable- to-connect- to-server- due-to- temporary- failure- in-name- resolution/ 1099311 for workaround.