[Bug 1895329] Re: when booting cloned live drive 3rd partition is created without file system

[sudodus]

The first test results from the current daily Ubuntu Groovy iso file

$ ls -l groovy-desktop-amd64.iso
-rw------- 1 sudodus sudodus 2936969216 okt  9 21:15 groovy-desktop-amd64.iso

$ md5sum groovy-desktop-amd64.iso
00cbcce8855c00dd2231077e3a01aebc  groovy-desktop-amd64.iso

indicate that that squashing bug #1886148 did also squash bug #1895329,
but now there is another 3rd partition, and we should look for a 4th
partition.

sudodus at bionic64 /media/multimed-2/test/ubuntu $ sudo kpartx -av groovy-desktop-amd64.iso
add map loop0p1 (253:0): 0 5725588 linear 7:0 64
add map loop0p2 (253:1): 0 9952 linear 7:0 5725652
add map loop0p3 (253:2): 0 600 linear 7:0 5735604

sudodus at bionic64 /media/multimed-2/test/ubuntu $ lsblk -f /dev/loop0
NAME      FSTYPE  LABEL              UUID                              MOUNTPOINT
loop0     iso9660 Ubuntu 20.10 amd64 2020-10-09-21-15-31-00                      
├─loop0p1 iso9660 Ubuntu 20.10 amd64 2020-10-09-21-15-31-00                      
├─loop0p2 vfat    ESP                6508-0C9E                                   
└─loop0p3                                                                        

sudodus at bionic64 /media/multimed-2/test/ubuntu $ sudo kpartx -d groovy-desktop-amd64.iso
loop deleted : /dev/loop0

After booting, there is a 'writable' partition.

sudodus at bionic64 /media/multimed-2/test/ubuntu $ lsblk -f /dev/sdc
NAME   FSTYPE  LABEL              UUID                                 MOUNTPOINT
sdc    iso9660 Ubuntu 20.10 amd64 2020-10-09-21-15-31-00                        
├─sdc1 iso9660 Ubuntu 20.10 amd64 2020-10-09-21-15-31-00                        
├─sdc2 vfat    ESP                6508-0C9E                                     
├─sdc3 iso9660 Ubuntu 20.10 amd64 2020-10-09-21-15-31-00                        
└─sdc4 ext4    writable           8b73f753-eb94-40ec-8995-f57c64933d3f

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https://bugs.launchpad.net/bugs/1895329

Title:
  when booting cloned live drive 3rd partition is created without file
  system

Status in casper package in Ubuntu:
  Incomplete

Bug description:
  When iso testing the current daily Lubuntu iso file (dated 2020-09-11),
  I notice that a third partition is created (during the boot process),
  but no file system is recognized by lsblk -f, and it is not used for
  logging (as we are used to from Focal and previous versions of Groovy).

  In this case it is seen by lsblk as /dev/sda3. See details in the
  attached file.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: casper 1.452
  ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
  Uname: Linux 5.8.0-18-generic x86_64
  ApportVersion: 2.20.11-0ubuntu45
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.452
  CurrentDesktop: LXQt
  Date: Fri Sep 11 17:20:03 2020
  LiveMediaBuild: Lubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200911)
  SourcePackage: casper
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.casper.conf: 2020-09-11T17:08:26.454154

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