Im also having similar problem . Initally due to display driver update but then it effected with failure on the display - blank screen, then fail to login at terminal (looping) then missing launcher-desktop.. now is like total unusable.
Im also having similar problem . Initally due to display driver update but then it effected with failure on the display - blank screen, then fail to login at terminal (looping) then missing launcher-desktop.. now is like total unusable.