@Igor: Thank you very much for this fast fix! It works for me!
My System is an Odroid HC1, booting from SD with rootfs on HDD: I wrote the minimal image to a new SD card, copied the required files from the boot directory to my “real” SD card and adjusted the UUID of the rootdev in boot.ini. The NAS is running again ... quick and dirty.
Stay healthy, the flu is around
I found the new image here: https://armbian.nardol.ovh/dl/odroidxu4/archive/
kometch reacted to else.ganz in apt upgrade → Size + hash Sum mismatches → Mirror sync in progress?