I met the following issue a few weeks back. I noticed that my SSD was full so i wanted to delete some of my useless datas to free up space. For some reason after deleting the files i could not empty the trash. I thought it must be some kind of bug so i rebboted my computer. After reboot the booting process stopped at loading the ubuntu logo. I had te reinstall the whole system. Does anyone know what could cause it, and how can i prevent such things?
You should have stopped after booting the live session. You could have deleted files from there by mounting your disks.
General sollution: do not use your root for personal files and keep either /home on a partition or put the directories in /home on a separate partition.