[Bug 1897173] Re: 20.10 Installer crashes with partitions being written but unable to inform kernel of the change

[Norbert]

Ubuntu MATE 20200930 beta is surprisingly no more affected by this bug. 
Tested on QuickEMU legacy and  EFI; and also on VirtualBox - both legacy and EFI.

@Bill (franksmcb), can you please confirm?

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https://bugs.launchpad.net/bugs/1897173

Title:
  20.10 Installer crashes with partitions being written but unable to
  inform kernel of the change

Status in parted package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu MATE currently daily 20.10 20200924 using QEMU.

  Expected outcome:
  Boot daily iso
  Choose Erase disk and install Ubuntu MATE
  Complete installation.

  Actual outcome:
  Boot daily iso
  Choose Erase disk and install Ubuntu MATE
  Install crashes with ERROR!!! (as superuser) Partition(s) on /dev/vda have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use. As a result, the old partition(s) will remain in use. You should reboot now before making further changes.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubiquity 20.10.10
  ProcVersionSignature: Ubuntu 5.8.0-19.20-generic 5.8.8
  Uname: Linux 5.8.0-19-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu47
  Architecture: amd64
  CasperMD5CheckMismatches: ./casper/filesystem.squashfs
  CasperMD5CheckResult: skip
  CasperVersion: 1.452
  CurrentDesktop: MATE
  Date: Thu Sep 24 19:29:19 2020
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu-MATE 20.10 "Groovy Gorilla" - Alpha amd64 (20200924)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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