I'm running 20.04 since March 28th, with full disk encryption alongside a Windows installation on EFI, and got the same error. Devices:
udev 7927804 0 7927804 0% /dev /dev/mapper/nvme0n1p7_crypt 501578960 48651080 427379388 11% / /dev/nvme0n1p6 267284 108360 138428 44% /boot /dev/nvme0n1p1 262144 55704 206440 22% /boot/efi
The device selection in the `apt upgrade` prompt didn't exacly match these, as can be seen in the attachment.
I'm running 20.04 since March 28th, with full disk encryption alongside a Windows installation on EFI, and got the same error. Devices:
udev 7927804 0 7927804 0% /dev nvme0n1p7_ crypt 501578960 48651080 427379388 11% /
/dev/mapper/
/dev/nvme0n1p6 267284 108360 138428 44% /boot
/dev/nvme0n1p1 262144 55704 206440 22% /boot/efi
The device selection in the `apt upgrade` prompt didn't exacly match these, as can be seen in the attachment.