[Bug 1969464] Re: Ubuntu 22.04 fails update Unpacking casper (1.470) over (1.468)

[Mélodie]

Hi, I am on the process of rebuilding Ubuntu 22.04 with personal
configuration and choice of package, using Cubic and I am also affected
by this bug.

```
root at cubic:~# apt upgrade
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  fwupd gcc-10-base guvcview libfwupd2 libfwupdplugin5 libgslcblas0 libguvcview-2.0-2 libinput-bin
  libinput10 libwacom-bin libwacom-common ubiquity ubiquity-frontend-gtk ubiquity-ubuntu-artwork
  xserver-xorg-input-libinput
The following packages will be upgraded:
  casper
1 upgraded, 0 newly installed, 0 to remove and 15 not upgraded.
Need to get 0 B/52.0 kB of archives.
After this operation, 10.2 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
(Reading database ... 139699 files and directories currently installed.)
Preparing to unpack .../casper_1.470.2_amd64.deb ...
Unpacking casper (1.470.2) over (1.445.3) ...
dpkg: error processing archive /var/cache/apt/archives/casper_1.470.2_amd64.deb (--unpack):
 trying to overwrite '/usr/share/initramfs-tools/scripts/casper-premount/20iso_scan', which is also in package lupin-casper 0.57build1
update-initramfs: deferring update (trigger activated)
Errors were encountered while processing:
 /var/cache/apt/archives/casper_1.470.2_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
root at cubic:~# 

```

I will follow up on the discussion. 
Thanks.

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https://bugs.launchpad.net/bugs/1969464

Title:
  Ubuntu 22.04 fails update Unpacking casper (1.470) over (1.468)

Status in casper package in Ubuntu:
  Expired
Status in ubiquity package in Ubuntu:
  Expired

Bug description:
  Ubuntu 22.04 was working fine until todays update.

  The following packages will be upgraded:
    casper
  1 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
  56 not fully installed or removed.
  Need to get 0 B/52.0 kB of archives.
  After this operation, 3,072 B of additional disk space will be used.
  Do you want to continue? [Y/n] y
  (Reading database ... 252642 files and directories currently installed.)
  Preparing to unpack .../casper_1.470_amd64.deb ...
  Unpacking casper (1.470) over (1.468) ...
  dpkg: error processing archive /var/cache/apt/archives/casper_1.470_amd64.deb (--unpack):
   trying to overwrite '/usr/share/initramfs-tools/scripts/casper-premount/20iso_scan', which is also in package lupin-casper 0.57build1
  update-initramfs: deferring update (trigger activated)
  Errors were encountered while processing:
   /var/cache/apt/archives/casper_1.470_amd64.deb
  E: Sub-process /usr/bin/dpkg returned an error code (1)

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