Debian Bullseye (11): zpool command missing

I have recently upgraded one of my debian servers from version 10 to 11.
My surprise when I wanted to mount my zfs pools after upgrade: zfs packages (zpool, zfs, etc) were missing.

I have upgraded debian in the past and usually this problem was solved with:

dpkg-reconfigure zfs-dkms

.

Not this time...

Digging more I found out some packages were missing so I had to install zfsutils-linux package:

I am not sure why it has been uninstalled, probably during the upgrade process but no worries, the installation was successful and zfs commands were available again :)

root@candy:~# apt install zfs-dkms zfsutils-linux
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
zfs-dkms is already the newest version (2.0.3-9).
The following additional packages will be installed:
  libnvpair3linux libuutil3linux libzfs4linux libzpool4linux zfs-zed
Suggested packages:
  samba-common-bin zfs-initramfs | zfs-dracut
The following NEW packages will be installed:
  libnvpair3linux libuutil3linux libzfs4linux libzpool4linux zfs-zed zfsutils-linux
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 2,150 kB of archives.
After this operation, 6,954 kB of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://deb.debian.org/debian bullseye/contrib amd64 libnvpair3linux amd64 2.0.3-9 [61.2 kB]
Get:2 http://deb.debian.org/debian bullseye/contrib amd64 libuutil3linux amd64 2.0.3-9 [54.0 kB]
Get:3 http://deb.debian.org/debian bullseye/contrib amd64 libzfs4linux amd64 2.0.3-9 [231 kB]
Get:4 http://deb.debian.org/debian bullseye/contrib amd64 libzpool4linux amd64 2.0.3-9 [1,247 kB]
Get:5 http://deb.debian.org/debian bullseye/contrib amd64 zfsutils-linux amd64 2.0.3-9 [481 kB]
Get:6 http://deb.debian.org/debian bullseye/contrib amd64 zfs-zed amd64 2.0.3-9 [75.4 kB]
Fetched 2,150 kB in 1s (1,626 kB/s)
Selecting previously unselected package libnvpair3linux.
(Reading database ... 76616 files and directories currently installed.)
Preparing to unpack .../0-libnvpair3linux_2.0.3-9_amd64.deb ...
Unpacking libnvpair3linux (2.0.3-9) ...
Selecting previously unselected package libuutil3linux.
Preparing to unpack .../1-libuutil3linux_2.0.3-9_amd64.deb ...
Unpacking libuutil3linux (2.0.3-9) ...
Selecting previously unselected package libzfs4linux.
Preparing to unpack .../2-libzfs4linux_2.0.3-9_amd64.deb ...
Unpacking libzfs4linux (2.0.3-9) ...
Selecting previously unselected package libzpool4linux.
Preparing to unpack .../3-libzpool4linux_2.0.3-9_amd64.deb ...
Unpacking libzpool4linux (2.0.3-9) ...
Selecting previously unselected package zfsutils-linux.
Preparing to unpack .../4-zfsutils-linux_2.0.3-9_amd64.deb ...
Unpacking zfsutils-linux (2.0.3-9) ...
Selecting previously unselected package zfs-zed.
Preparing to unpack .../5-zfs-zed_2.0.3-9_amd64.deb ...
Unpacking zfs-zed (2.0.3-9) ...
Setting up libnvpair3linux (2.0.3-9) ...
Setting up libuutil3linux (2.0.3-9) ...
Setting up libzfs4linux (2.0.3-9) ...
Setting up libzpool4linux (2.0.3-9) ...
Setting up zfsutils-linux (2.0.3-9) ...
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/spl.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/znvpair.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/zcommon.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/icp.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/zavl.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/zlua.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/zzstd.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/zunicode.ko 
insmod /lib/modules/5.10.0-9-amd64/updates/dkms/zfs.ko 
zfs-import-scan.service is a disabled or a static unit, not starting it.
Setting up zfs-zed (2.0.3-9) ...
Processing triggers for man-db (2.9.4-2) ...
Processing triggers for libc-bin (2.31-13+deb11u2) ...

Enjoy!