After allowing Ubuntu to upgrade itself a while back, it seems to get stuck while booting. It alternates between a black screen, then a white screen with the cursor, then back to the black screen over and over. I've read all the other posts here and elsewhere that seem to point to NVidia but I don't have NVidia.
Holding Shift while booting and selecting Advanced options for Ubuntu, then selecting Recovery Mode, when I select the Resume Normal Boot choice from the Recovery Menu, it boots as it should. Any ideas how to fix it short of a fresh install?