After switching from Debian stable to Debian testing i have a problem to mount my FreeBSD root partition on my system:How to mount ufs file system under Debian testing?I find out what filesystems my Linux kernel supports through this command cat /proc/filesystems :nodev   sysfsnodev   rootfsnodev   ramfsnodev   bdevnodev   procnodev   cpusetnodev   cgroupnodev   cgroup2nodev   tmpfsnodev   devtmpfsnodev   debugfsnodev   tracefsnodev   securityfsnodev   sockfsnodev   bpfnodev   pipefsnodev   hugetlbfsnodev   devptsnodev   pstorenodev   mqueue    ext3    ext2    ext4nodev   autofs    btrfsBy default The Linux Kernel cant read/write on FreeBSD-ufs  partition.How to enable Unix file system (ufs) support on Linux kernel?Updatethe output of:modprobe ufsmount -t ufs -o ufstype=ufs2 /dev/sda4 /mnt/ufs_mountis:mount: /dev/sda4 is write-protected, mounting read-onlymount: wrong fs type, bad option, bad superblock on /dev/sda4,missing codepage or helper program, or other error   In some cases useful info is found in syslog - try   dmesg | tail or so.The output of dmesg | tail :   [ 1136.965142] ufs: ufs_fill_super(): bad magic number[ 1255.758946] ufs: ufs_fill_super(): bad magic number[ 2098.945757] ufs: ufs was compiled with read-only support, can't be mounted as read-write[ 2098.946045] ufs: You didn't specify the type of your ufs filesystem      mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...      >>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old[ 2098.967212] ufs: ufs_fill_super(): bad magic number[ 2927.982112] perf: interrupt took too long (2504 > 2500), lowering kernel.perf_event_max_sample_rate to 79750My sources.list:deb http://httpredir.debian.org/debian/ stretch maindeb-src http://httpredir.debian.org/debian/ stretch maindeb http://security.debian.org/debian-security stretch/updates maindeb-src http://security.debian.org/debian-security stretch/updates mainAnd uname -a:Linux debian 4.6.0-1-amd64 #1 SMP Debian 4.6.4-1 (2016-07-18) x86_64 GNU/Linux
How to enable Unix file system support on Linux kernel?
debian;kernel;linux kernel;freebsd;ufs
Using a standard debian kernel?Try modprobe ufs as root to load UFS filesystem support.