So, a new problem for me. I have an RPI 3B+ that has been working just fine. I did my weekly sudo apt update, sudo apt upgrade (about 11 files were listed to upgrade) and all seemed fine. Then, I did a restart. I see teh normal boot messages and then the desktop appears and then nothing; it seems to be hung! No keyboard or mouse response. I do see the CPU % box changing. From a different Rpi, I tried to VNC in and SSH in. All failed.
I have no idea what to do or how to get to any settings or files to boot to the command line.
Any ideas what i can do?