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Cannot boot ubuntu 20.04 LTS after 5.4.0-89-generic and -88-generic updates

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Dell precision 7520, dual boot, Windows still works fine, secure boot off, can access grub menu and bios. Updated the kernel and nvidia drivers yesterday. System freezes in both normal and recovery boot modes. In recovery mode the freeze happens almost immediately. The screen looks a bit corrupted, with some of the boot progress messaging in echelon across the screen. I can’t access any of the menu items. In regular boot it gets to the purple ubuntu login screen and halts. Ctrl-Alt-F2 does nothing, mouse inoperable. What to do?

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