Rootless X is owned by xuser, the problem is xuser doesn't have permissions to
write usb storage when the type of filesystem is not one of ext2/3/4 and btrfs.
...
mount
/dev/sdb1 on /media/sdb1 type ext4
/dev/sdb2 on /media/sdb2 type vfat
/dev/sdb3 on /media/sdb3 type ntfs
/dev/sdb4 on /media/sdb4
Rootless X is owned by xuser, the problem is xuser doesn't have permissions to
write usb storage when the type of filesystem is not one of ext2/3/4 or btrfs.
...
mount
/dev/sdb1 on /media/sdb1 type ext4
/dev/sdb2 on /media/sdb2 type vfat
/dev/sdb3 on /media/sdb3 type ntfs
/dev/sdb4 on /media/sdb4 t
