------- Comment From [email protected] 2020-03-10 11:53 EDT-------
I have tried with  "live-server" image... from below location:
http://cdimage.ubuntu.com/ubuntu-server/daily-live/current/focal-live-server-ppc64el.iso

Loaded the ISO as Virtual media on Witherspoon system. This should show
an entry at petitb menu like mentioned below:

[USB: sda / 2020-03-06-07-31-43-00]
*  Install Ubuntu Server

Kick started the install... but installer thrown with below errors....

>>>>>>
SIGTERM received, booting...
[  409.757063] kexec_core: Starting new kernel
[    5.242228] nouveau 0004:04:00.0: fifo: fault 00 [VIRT_READ] at 
0000000000050000 engine 27 [HOST7] client 06 [HUB/HOST] reason 02 [PTE] on 
channel 1 [07ff8fa000 DRM]
[    5.242336] nouveau 0004:04:00.0: bus: MMIO read of 00000000 FAULT at 6013d4 
[ TIMEOUT ]
[    5.526283] nouveau 0004:05:00.0: fifo: fault 00 [VIRT_READ] at 
0000000000050000 engine 27 [HOST7] client 06 [HUB/HOST] reason 02 [PTE] on 
channel 1 [07ff8fa000 DRM]
[    5.526362] nouveau 0004:05:00.0: bus: MMIO read of 00000000 FAULT at 6013d4 
[ TIMEOUT ]
[    5.725042] nouveau 0035:03:00.0: fifo: fault 00 [VIRT_READ] at 
0000000000050000 engine 27 [HOST7] client 06 [HUB/HOST] reason 02 [PTE] on 
channel 1 [07ff8fa000 DRM]
[    5.725128] nouveau 0035:03:00.0: bus: MMIO read of 00000000 FAULT at 6013d4 
[ TIMEOUT ]
[    5.923066] nouveau 0035:04:00.0: fifo: fault 00 [VIRT_READ] at 
0000000000050000 engine 27 [HOST7] client 06 [HUB/HOST] reason 02 [PTE] on 
channel 1 [07ff8fa000 DRM]
[    5.923149] nouveau 0035:04:00.0: bus: MMIO read of 00000000 FAULT at 6013d4 
[ TIMEOUT ]
[    6.355327] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.355351] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x80700 phys_seg 1 prio class 0
[    6.359079] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.359094] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.359108] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.361443] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.361455] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.361467] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.366444] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.366461] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.366473] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.370068] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.370082] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.370094] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.370132] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.370157] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.370178] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.376195] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.376210] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.376232] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.380946] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.380959] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.380971] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.386445] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.386463] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.386475] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.390321] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.390337] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[    6.390358] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.407946] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.407991] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.408014] Buffer I/O error on dev sdc1, logical block 0, async page read
[    6.414696] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.416320] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.419321] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    6.419366] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    7.755944] lpfc 0030:01:00.0: 0:1303 Link Up Event x1 received Data: x1 x1 
x20 x0 x0 x0 0
[    8.404072] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    8.466662] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    8.481665] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[    8.485731] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[   10.242328] lpfc 0030:01:00.1: 1:1303 Link Up Event x1 received Data: x1 x1 
x20 x0 x0 x0 0
ln: /tmp/mountroot-fail-hooks.d//scripts/init-premount/lvm2: No such file or 
directory
[   16.243920] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[   16.243945] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x80700 phys_seg 1 prio class 0
[   16.243985] sd 5:0:0:0: [sdc] tag#0 request not aligned to the logical block 
size
[   16.243996] blk_update_request: I/O error, dev sdc, sector 1 op 0x0:(READ) 
flags 0x0 phys_seg 1 prio class 0
[   16.244018] Buffer I/O error on dev sdc1, logical block 0, async page read
stdin: I/O error
mount: mounting /cow on /root/cow failed: No such file or directory
Connecting to plymouth: Connection refused

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https://bugs.launchpad.net/bugs/1861655

Title:
  [Ubu 20.04][kernel-5.4.0-12-generic][WSP-DD2.3] Unable to install Ubu
  20.4 on NVMe disk

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