Yesterdays updates

[LarryB1607]

I have LL on an external HDD.  When I now try to boot I get the GRUB menu and let it default to Ubuntu.  Instead of going to the LL login screen, the system hangs up.  Part of the error message say something about a controller and that the USB device was not recognized.  I got major updates yesterday that looked like Ubuntu version updates.  Not sure where to proceed from here.  I might have a timeshift backup, but not a very recent one and if I cannot boot into LL, is kind of tough to run Timeshift.  I will check to see if I have a backup on other media.