With the latest 12.3 image couldn't initialize the USB drive in order to use it for flashexpand.
Here are the errors:
Aug 10 15:40:44 dm800se user.err mount.exfat-fuse: exFAT file system is not found
Aug 10 15:40:44 dm800se kern.err kernel: [ 1330.149000] EXT4-fs (sda1): Couldn't mount because of unsupported optional features (2000)
And this is how I fixed it. There is some journal incompatibility.
root@dm800se:~# mke2fs /dev/sda1 -O ^metadata_csum
