how to mount NetBSD ffs partition under live linux

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First import ufs module from terminal :

sudo modprobe ufs

Then find your NetBSD partition using :

sfdisk -l

And mount NetBSD partition with :

mkdir /mnt/netbsd
mount -t ufs -o ro,ufstype=44bsd /dev/sda1 /mnt/netbsd/

Jay First import ufs module from terminal :
sudo modprobe ufs

or, if mounting UFS is planned on fron the begin, one can configire a kernel with built-in support by specifying in the kernel config:

CONFIG_UFS_FS=y
CONFIG_UFS_FS_WRITE=y

And mount NetBSD partition with :
mkdir /mnt/netbsd
mount -t ufs -o ro,ufstype=44bsd /dev/sda1 /mnt/netbsd/

also, in order to mount a FFSv2 (UFS2) partition:

sudo mount -t ufs -o ufstype=ufs2 /dev/sda1 /mnt/netbsd

Side Note: Illumos UFS support is codified by ufstype=sun