Comment 2 for bug 1914587

I searched for possibly relevant upstream xorriso bugs but only found old issues which are certainly fixed in all the supported Ubuntu releases. I wonder if this is arch dependent for some odd reason.

I'm attaching the log of the latest successful run, which ran using the ISO with the following media info:

Ubuntu-Server 20.04.2 LTS "Focal Fossa" - Release ppc64el (20210129)

Xorriso behaved well in this case:

+ xorriso -as mkisofs -V 'Ubuntu-Server 20.04.2 LTS ppc64' --modification-date=2021012910021700 -partition_cyl_align off -partition_offset 0 -apm-block-size 512 -G --interval:local_fs:0s-15s:zero_mbrpt,zero_apm:/var/cache/utah/iso/focal-live-server-ppc64el.iso -iso_mbr_part_type 0x96 -o /jenkins/servers/platformqa/workspace/ubuntu-focal-live-server-ppc64el-smoke-edge/edge-focal-live-server-ppc64el.iso -V 'Ubuntu custom' new_iso
xorriso 1.4.8 : RockRidge filesystem manipulator, libburnia project.

Drive current: -outdev 'stdio:/jenkins/servers/platformqa/workspace/ubuntu-focal-live-server-ppc64el-smoke-edge/edge-focal-live-server-ppc64el.iso'
Media current: stdio file, overwriteable
Media status : is blank
Media summary: 0 sessions, 0 data blocks, 0 data, 241g free
xorriso : WARNING : -volid text problematic as automatic mount point name
xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules
xorriso : WARNING : -volid text problematic as automatic mount point name
xorriso : WARNING : -volid text does not comply to ISO 9660 / ECMA 119 rules
Added to ISO image: directory '/'='/tmp/tmp.PYltA0oLMJ/new_iso'
xorriso : UPDATE : 130 files added in 1 seconds
xorriso : UPDATE : 130 files added in 1 seconds
xorriso : NOTE : Copying to System Area: 32768 bytes from file '--interval:local_fs:0s-15s:zero_mbrpt,zero_apm:/var/cache/utah/iso/focal-live-server-ppc64el.iso'
libisofs: NOTE : Automatically adjusted MBR geometry to 1012/77/32
xorriso : UPDATE : 8.98% done
xorriso : UPDATE : 54.53% done
ISO image produced: 623348 sectors
Written to medium : 623348 sectors at LBA 0
Writing to 'stdio:/jenkins/servers/platformqa/workspace/ubuntu-focal-live-server-ppc64el-smoke-edge/edge-focal-live-server-ppc64el.iso' completed successfully.