Unfortunately, this is related to multipath and lvm competing again. I
can't tell how 26.10 is different from 26.04 in that regard.

The installer environment was able to bring ubuntu-vg--ubuntu-lv up, but
based on the /dev/sda2 device, not based on mpatha:

$ systemctl status multipathd
Sep 07 13:49:00 ubuntu-server multipathd[1253]: mpatha: addmap [0 402653184 
multipath 1 queue_if_no_path 1 alua 1 1 service-time 0 4 1 8:32 1 8:48 1 8:0 1 
8:16 1]
Sep 07 13:49:00 ubuntu-server multipathd[1253]: libdevmapper: 
ioctl/libdm-iface.c(1995): device-mapper: reload ioctl on mpatha (252:1) 
failed: Device or resource busy
Sep 07 13:49:00 ubuntu-server multipathd[1253]: dm_addmap: libdm task=0 error: 
Device or resource busy
Sep 07 13:49:00 ubuntu-server multipathd[1253]: mpatha: ignoring map


$ dmsetup info
Name:              ubuntu--vg-ubuntu--lv
State:             ACTIVE
Read Ahead:        256
Tables present:    LIVE
Open count:        0
Event number:      0
Major, minor:      252, 0
Number of targets: 1
UUID: LVM-EScPNWbnEQwMogqtRgCeV2E4XNWSZ3BdHZsWJgtLAIZYLvzQx3rOWs3UqAV8AFU4

$ dmsetup deps -o blkdevname
ubuntu--vg-ubuntu--lv: 1 dependencies   : (sda2)

But standard LVM tools don't report any vgs, lvs or pvs because of the
duplicate PV ID:

$ vgs
<no output>

It's possible to disable devices/multipath_component_detection to show
them though:

$ vgs --config devices/multipath_component_detection=0
  WARNING: Not using device /dev/sdc2 for PV 
h6EXDD-EbjY-1tFd-pji1-O1kC-6hyh-x7YVEu.
  WARNING: Not using device /dev/sdd2 for PV 
h6EXDD-EbjY-1tFd-pji1-O1kC-6hyh-x7YVEu.
  WARNING: Not using device /dev/sdb2 for PV 
h6EXDD-EbjY-1tFd-pji1-O1kC-6hyh-x7YVEu.
  WARNING: PV h6EXDD-EbjY-1tFd-pji1-O1kC-6hyh-x7YVEu prefers device /dev/sda2 
because device is used by LV.
  WARNING: PV h6EXDD-EbjY-1tFd-pji1-O1kC-6hyh-x7YVEu prefers device /dev/sda2 
because device is used by LV.
  WARNING: PV h6EXDD-EbjY-1tFd-pji1-O1kC-6hyh-x7YVEu prefers device /dev/sda2 
because device is used by LV.
  VG        #PV #LV #SN Attr   VSize    VFree
  ubuntu-vg   1   1   0 wz--n- <190.00g    0 

Logs from the journal:

Sep 07 13:21:05 ubuntu-server vgs[19078]: devices/multipath_component_detection 
not found in config: defaulting to 1
Sep 07 13:21:05 ubuntu-server vgs[19078]: Checking for multipath components for 
duplicate PVID h6EXDDEbjY1tFdpji1O1kC6hyhx7YVEu
Sep 07 13:21:05 ubuntu-server vgs[19078]: Same wwids for duplicate PVs 
/dev/sdb2 /dev/sda2
Sep 07 13:21:05 ubuntu-server vgs[19078]: Same wwids for duplicate PVs 
/dev/sdb2 /dev/sdc2
Sep 07 13:21:05 ubuntu-server vgs[19078]: Same wwids for duplicate PVs 
/dev/sdb2 /dev/sdd2
Sep 07 13:21:05 ubuntu-server vgs[19078]: Ignoring multipath component 
/dev/sdb2 with PVID h6EXDDEbjY1tFdpji1O1kC6hyhx7YVEu (dropping info)
Sep 07 13:21:05 ubuntu-server vgs[19078]: Ignoring multipath component 
/dev/sda2 with PVID h6EXDDEbjY1tFdpji1O1kC6hyhx7YVEu (dropping duplicate)
Sep 07 13:21:05 ubuntu-server vgs[19078]: Ignoring multipath component 
/dev/sdc2 with PVID h6EXDDEbjY1tFdpji1O1kC6hyhx7YVEu (dropping duplicate)
Sep 07 13:21:05 ubuntu-server vgs[19078]: Ignoring multipath component 
/dev/sdd2 with PVID h6EXDDEbjY1tFdpji1O1kC6hyhx7YVEu (dropping duplicate)
Sep 07 13:21:05 ubuntu-server vgs[19078]: lvmcache label scan done
Sep 07 13:21:05 ubuntu-server vgs[19078]: Obtaining the complete list of VGs to 
process
Sep 07 13:21:05 ubuntu-server vgs[19078]: No volume groups found

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https://bugs.launchpad.net/bugs/2165993

Title:
  Ubuntu 26.10/stonking installation (image from Aug 31st) crashes on
  s390x (due to probert)

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