Successful use of the decrypted data, with 25.10 in live mode, although I don’t understand why the pool will not export:
no response to sudo zpool export rpool
kubuntu@kubuntu:~$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
rpool 408G 484G 192K /tmp/altroot
rpool/ROOT 25.2G 484G 192K none
rpool/ROOT/ubuntu_v0hpws 25.2G 484G 10.1G /tmp/altroot
rpool/ROOT/ubuntu_v0hpws/srv 192K 484G 192K /tmp/altroot/srv
rpool/ROOT/ubuntu_v0hpws/usr 11.8M 484G 192K /tmp/altroot/usr
rpool/ROOT/ubuntu_v0hpws/usr/local 11.6M 484G 11.6M /tmp/altroot/usr/local
rpool/ROOT/ubuntu_v0hpws/var 15.1G 484G 192K /tmp/altroot/var
rpool/ROOT/ubuntu_v0hpws/var/games 192K 484G 192K /tmp/altroot/var/games
rpool/ROOT/ubuntu_v0hpws/var/lib 13.0G 484G 12.7G /tmp/altroot/var/lib
rpool/ROOT/ubuntu_v0hpws/var/lib/AccountsService 212K 484G 212K /tmp/altroot/var/lib/AccountsService
rpool/ROOT/ubuntu_v0hpws/var/lib/NetworkManager 384K 484G 384K /tmp/altroot/var/lib/NetworkManager
rpool/ROOT/ubuntu_v0hpws/var/lib/apt 113M 484G 113M /tmp/altroot/var/lib/apt
rpool/ROOT/ubuntu_v0hpws/var/lib/dpkg 112M 484G 112M /tmp/altroot/var/lib/dpkg
rpool/ROOT/ubuntu_v0hpws/var/log 2.08G 484G 2.08G /tmp/altroot/var/log
rpool/ROOT/ubuntu_v0hpws/var/mail 192K 484G 192K /tmp/altroot/var/mail
rpool/ROOT/ubuntu_v0hpws/var/snap 10.5M 484G 10.5M /tmp/altroot/var/snap
rpool/ROOT/ubuntu_v0hpws/var/spool 868K 484G 868K /tmp/altroot/var/spool
rpool/ROOT/ubuntu_v0hpws/var/www 192K 484G 192K /tmp/altroot/var/www
rpool/USERDATA 383G 484G 192K none
rpool/USERDATA/home_dz7uxs 383G 484G 383G /tmp/altroot/home
rpool/USERDATA/root_dz7uxs 27.2M 484G 27.2M /tmp/altroot/root
rpool/keystore 38.8M 484G 16.5M -
rpool/var 1.98M 484G 192K /tmp/altroot/var
rpool/var/lib 1.79M 484G 192K /tmp/altroot/var/lib
rpool/var/lib/docker 1.61M 484G 1.61M /tmp/altroot/var/lib/docker
kubuntu@kubuntu:~$ sudo cryptsetup open /dev/zvol/rpool/keystore zfskey
Enter passphrase for /dev/zvol/rpool/keystore:
kubuntu@kubuntu:~$ sudo cat /media/kubuntu/keystore-rpool/system.key | sudo zfs load-key -L prompt rpool
kubuntu@kubuntu:~$ sudo zfs mount -a
kubuntu@kubuntu:~$ mount | grep zfs | sort
/dev/mapper/zfskey on /media/kubuntu/keystore-rpool type ext4 (rw,nosuid,nodev,relatime,errors=remount-ro,stripe=8192,uhelper=udisks2)
rpool/ROOT/ubuntu_v0hpws on /tmp/altroot type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/srv on /tmp/altroot/srv type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/usr/local on /tmp/altroot/usr/local type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/games on /tmp/altroot/var/games type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/lib on /tmp/altroot/var/lib type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/lib/AccountsService on /tmp/altroot/var/lib/AccountsService type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/lib/NetworkManager on /tmp/altroot/var/lib/NetworkManager type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/lib/apt on /tmp/altroot/var/lib/apt type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/lib/dpkg on /tmp/altroot/var/lib/dpkg type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/log on /tmp/altroot/var/log type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/mail on /tmp/altroot/var/mail type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/snap on /tmp/altroot/var/snap type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/spool on /tmp/altroot/var/spool type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/ROOT/ubuntu_v0hpws/var/www on /tmp/altroot/var/www type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/USERDATA/home_dz7uxs on /tmp/altroot/home type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/USERDATA/root_dz7uxs on /tmp/altroot/root type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
rpool/var/lib/docker on /tmp/altroot/var/lib/docker type zfs (rw,nodev,relatime,xattr,posixacl,casesensitive)
kubuntu@kubuntu:~$ ls -hl /tmp/altroot/home/grahamperrin/Desktop/2025-09-*
-rw-rw-r-- 1 kubuntu kubuntu 423K Sep 6 18:55 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-06 20-37 pkg issue 2475, 257 candidates, success.txt'
-rw-rw-r-- 1 kubuntu kubuntu 19K Sep 7 12:51 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-07 13- killing at 552 of 1309 (discount) during a major upgrade with 1 GB memory.png'
-rw-rw-r-- 1 kubuntu kubuntu 129K Sep 16 21:30 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-16 22-29 KDE Plasma, FreeBSD 16.0-CURRENT.png'
-rw-rw-r-- 1 kubuntu kubuntu 39K Sep 17 04:46 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-17 05-44 FreeBSD 15.0-ALPHA2 zpool scrub of a read-only pool.png'
-rw-rw-r-- 1 kubuntu kubuntu 90K Sep 17 05:29 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-17 06-29 Phoronix, unable to type a comment.png'
-rw-rw-r-- 1 kubuntu kubuntu 125K Sep 17 22:04 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-17 got on FreeBSD 15.0-ALPHA2 requires libretls.png'
-rw-rw-r-- 1 kubuntu kubuntu 712K Sep 20 13:30 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-20 14-27 Firefox, pkgbase.png'
-rw-rw-r-- 1 kubuntu kubuntu 59K Sep 20 13:43 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-20 14-42 Firefox bars.png'
-rw-rw-r-- 1 kubuntu kubuntu 3.0M Sep 21 06:48 /tmp/altroot/home/grahamperrin/Desktop/2025-09-21.06-21.typescript.txt
-rw-rw-r-- 1 kubuntu kubuntu 93K Sep 22 04:43 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-22 05-38 pkg issue 2522 comment 3316711750 tail of typescript.txt'
-rw-rw-r-- 1 kubuntu kubuntu 69K Sep 22 20:43 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-22 21-21 ALPHA3 userland upgrade failed.png'
-rw-rw-r-- 1 kubuntu kubuntu 44K Sep 22 20:50 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-22 21-50 single user mode broken.png'
-rw-rw-r-- 1 kubuntu kubuntu 73K Sep 27 13:50 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-27 14-49 ignorant troublemaker.png'
-rw-rw-r-- 1 kubuntu kubuntu 54K Sep 27 23:58 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-28 00-58 118 to be removed.png'
-rw-rw-r-- 1 kubuntu kubuntu 55K Sep 28 00:00 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-28 01-00 proceeding.png'
-rw-rw-r-- 1 kubuntu kubuntu 69K Sep 28 00:16 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-28 01-15 -uY after upgrading the kernel alone.png'
-rw-rw-r-- 1 kubuntu kubuntu 320K Sep 28 10:30 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-28 11-30 swap off, reinstallation failed.png'
-rw-rw-r-- 1 kubuntu kubuntu 11K Sep 28 01:33 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-28 ALPHA4, base, the complete base.png'
-rw-rw-r-- 1 kubuntu kubuntu 30K Sep 28 05:46 '/tmp/altroot/home/grahamperrin/Desktop/2025-09-28-06-40 15.0-ALPHA4 REPOS_DIR.png'
kubuntu@kubuntu:~$ zpool export rpool
cannot unmount '/tmp/altroot/var/www': permission denied
kubuntu@kubuntu:~$ sudo zpool export rpool
^T^C
The tail:
kubuntu@kubuntu:~$ sudo zpool export rpool
^T^C
- no response to Control-T or Control-C.
In a separate Konsole tab:
kubuntu@kubuntu:~$ sudo lsof /tmp/altroot
lsof: WARNING: can't stat() fuse.portal file system /run/user/1000/doc
Output information may be incomplete.
kubuntu@kubuntu:~$ sudo lsof /tmp/altroot
lsof: WARNING: can't stat() fuse.portal file system /run/user/1000/doc
Output information may be incomplete.
kubuntu@kubuntu:~$ mount | grep zfs
/dev/mapper/zfskey on /media/kubuntu/keystore-rpool type ext4 (rw,nosuid,nodev,relatime,errors=remount-ro,stripe=8192,uhelper=udisks2)
kubuntu@kubuntu:~$ zpool status -v
pool: rpool
state: ONLINE
scan: scrub repaired 0B in 00:18:38 with 0 errors on Sat Oct 11 23:42:41 2025
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
wwn-0x5002538f42b2daed-part4 ONLINE 0 0 0
errors: No known data errors
kubuntu@kubuntu:~$