[SOLVED] After updating yesterday...

[Nachteule]

So I can't believe that you get can't read superblock as error message

/boot/cmdline.txt already checked? [1]

Must be something like this:

Code:

telnet zswap.enabled=1 zswap.compressor=lz4 console=tty1 root=/dev/mmcblk0p2 rootflags=subvol=root/@,autodefrag,compress=lz4 rootfstype=btrfs rootwait logo.nologo quiet noswap loglevel=0 partswap startevent=mountall selinux=0 splash nohdparm --startup-event mountall

[1] You have to mount first partition before you have access to that folder:
mount /dev/mmcblk0p1 /mnt
cat /mnt/cmdline.txt