Comment 9 for bug 2060544

Test done on Noble:
1- Confirming that gawk is not in use:
$ awk --version

mawk 1.3.4 20240123
Copyright 2008-2023,2024, Thomas E. Dickey
Copyright 1991-1996,2014, Michael D. Brennan

random-funcs: arc4random_stir/arc4random
regex-funcs: internal

compiled limits:
sprintf buffer 8192
maximum-integer 9223372036854775808

2- Verify that ppa-purge from proposed is installed:
$ apt list ppa-purge

Listing... Done
ppa-purge/noble-proposed,now 0.2.8+bzr63-0ubuntu2.1 all [installed]

3- Install mesa from oibaf ppa:
$ apt list mesa-vulkan-drivers

Listing... Done
mesa-vulkan-drivers/noble,now 24.2~git2406140600.39fdd2~oibaf~n amd64 [installed,automatic]

4- Remove the oibaf ppa using ppa-purge:
$ sudo ppa-purge ppa:oibaf/graphics-drivers

Updating packages lists
Warning: The unit file, source configuration file or drop-ins of apt-news.service changed on disk. Run 'systemctl daemon-reload' to reload units.
Warning: The unit file, source configuration file or drop-ins of esm-cache.service changed on disk. Run 'systemctl daemon-reload' to reload units.
W: https://ppa.launchpadcontent.net/oibaf/graphics-drivers/ubuntu/dists/noble/InRelease: Signature by key 5ABCE68FF4633EA42E219156957D2708A03A4626 uses weak algorithm (rsa1024)
PPA to be removed: oibaf graphics-drivers
Package revert list generated:
 libdrm-amdgpu1:amd64/noble libdrm-common/noble libdrm-intel1:amd64/noble
libdrm-nouveau2:amd64/noble libdrm-radeon1:amd64/noble libdrm2:amd64/noble
libegl-mesa0:amd64/noble libgbm1:amd64/noble libgl1-mesa-dri:amd64/noble
libglapi-mesa:amd64/noble libglx-mesa0:amd64/noble libxatracker2:amd64/noble
mesa-vulkan-drivers:amd64/noble

Updating packages lists
Warning: The unit file, source configuration file or drop-ins of apt-news.service changed on disk. Run 'systemctl daemon-reload' to reload units.
Warning: The unit file, source configuration file or drop-ins of esm-cache.service changed on disk. Run 'systemctl daemon-reload' to reload units.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Selected version '2.4.120-2build1' (Ubuntu:24.04/noble [amd64]) for 'libdrm-amdgpu1'
Selected version '2.4.120-2build1' (Ubuntu:24.04/noble [all]) for 'libdrm-common'
Selected version '2.4.120-2build1' (Ubuntu:24.04/noble [amd64]) for 'libdrm-intel1'
Selected version '2.4.120-2build1' (Ubuntu:24.04/noble [amd64]) for 'libdrm-nouveau2'
Selected version '2.4.120-2build1' (Ubuntu:24.04/noble [amd64]) for 'libdrm-radeon1'
Selected version '2.4.120-2build1' (Ubuntu:24.04/noble [amd64]) for 'libdrm2'
Selected version '24.0.5-1ubuntu1' (Ubuntu:24.04/noble [amd64]) for 'libegl-mesa0'
Selected version '24.0.5-1ubuntu1' (Ubuntu:24.04/noble [amd64]) for 'libgbm1'
Selected version '24.0.5-1ubuntu1' (Ubuntu:24.04/noble [amd64]) for 'libgl1-mesa-dri'
Selected version '24.0.5-1ubuntu1' (Ubuntu:24.04/noble [amd64]) for 'libglapi-mesa'
Selected version '24.0.5-1ubuntu1' (Ubuntu:24.04/noble [amd64]) for 'libglx-mesa0'
Selected version '24.0.5-1ubuntu1' (Ubuntu:24.04/noble [amd64]) for 'libxatracker2'
Selected version '24.0.5-1ubuntu1' (Ubuntu:24.04/noble [amd64]) for 'mesa-vulkan-drivers'
The following packages will be DOWNGRADED:
  libdrm-amdgpu1 libdrm-common libdrm-intel1 libdrm-nouveau2 libdrm-radeon1
  libdrm2 libegl-mesa0 libgbm1 libgl1-mesa-dri libglapi-mesa libglx-mesa0
  libxatracker2 mesa-vulkan-drivers
0 upgraded, 0 newly installed, 13 downgraded, 0 to remove and 1 not upgraded.
Need to get 0 B/22.6 MB of archives.
After this operation, 39.8 MB disk space will be freed.
Do you want to continue? [Y/n]
dpkg: warning: downgrading libdrm2:amd64 from 2.4.121+git2406040500.7f2091~oibaf~n to 2.4.120-2build1
(Reading database ... 147892 files and directories currently installed.)
Preparing to unpack .../00-libdrm2_2.4.120-2build1_amd64.deb ...
Unpacking libdrm2:amd64 (2.4.120-2build1) over (2.4.121+git2406040500.7f2091~oibaf~n) ...
dpkg: warning: downgrading libdrm-common from 2.4.121+git2406040500.7f2091~oibaf~n to 2.4.120-2build1
Preparing to unpack .../01-libdrm-common_2.4.120-2build1_all.deb ...
Unpacking libdrm-common (2.4.120-2build1) over (2.4.121+git2406040500.7f2091~oibaf~n) ...
dpkg: warning: downgrading libdrm-amdgpu1:amd64 from 2.4.121+git2406040500.7f2091~oibaf~n to 2.4.120-2build1
Preparing to unpack .../02-libdrm-amdgpu1_2.4.120-2build1_amd64.deb ...
Unpacking libdrm-amdgpu1:amd64 (2.4.120-2build1) over (2.4.121+git2406040500.7f2091~oibaf~n) ...
dpkg: warning: downgrading libdrm-intel1:amd64 from 2.4.121+git2406040500.7f2091~oibaf~n to 2.4.120-2build1
Preparing to unpack .../03-libdrm-intel1_2.4.120-2build1_amd64.deb ...
Unpacking libdrm-intel1:amd64 (2.4.120-2build1) over (2.4.121+git2406040500.7f2091~oibaf~n) ...
dpkg: warning: downgrading libdrm-nouveau2:amd64 from 2.4.121+git2406040500.7f2091~oibaf~n to 2.4.120-2build1
Preparing to unpack .../04-libdrm-nouveau2_2.4.120-2build1_amd64.deb ...
Unpacking libdrm-nouveau2:amd64 (2.4.120-2build1) over (2.4.121+git2406040500.7f2091~oibaf~n) ...
dpkg: warning: downgrading libdrm-radeon1:amd64 from 2.4.121+git2406040500.7f2091~oibaf~n to 2.4.120-2build1
Preparing to unpack .../05-libdrm-radeon1_2.4.120-2build1_amd64.deb ...
Unpacking libdrm-radeon1:amd64 (2.4.120-2build1) over (2.4.121+git2406040500.7f2091~oibaf~n) ...
dpkg: warning: downgrading libegl-mesa0:amd64 from 24.2~git2406140600.39fdd2~oibaf~n to 24.0.5-1ubuntu1
Preparing to unpack .../06-libegl-mesa0_24.0.5-1ubuntu1_amd64.deb ...
Unpacking libegl-mesa0:amd64 (24.0.5-1ubuntu1) over (24.2~git2406140600.39fdd2~oibaf~n) ...
dpkg: warning: downgrading libgbm1:amd64 from 24.2~git2406140600.39fdd2~oibaf~n to 24.0.5-1ubuntu1
Preparing to unpack .../07-libgbm1_24.0.5-1ubuntu1_amd64.deb ...
Unpacking libgbm1:amd64 (24.0.5-1ubuntu1) over (24.2~git2406140600.39fdd2~oibaf~n) ...
dpkg: warning: downgrading libgl1-mesa-dri:amd64 from 24.2~git2406140600.39fdd2~oibaf~n to 24.0.5-1ubuntu1
Preparing to unpack .../08-libgl1-mesa-dri_24.0.5-1ubuntu1_amd64.deb ...
Unpacking libgl1-mesa-dri:amd64 (24.0.5-1ubuntu1) over (24.2~git2406140600.39fdd2~oibaf~n) ...
dpkg: warning: downgrading libglx-mesa0:amd64 from 24.2~git2406140600.39fdd2~oibaf~n to 24.0.5-1ubuntu1
Preparing to unpack .../09-libglx-mesa0_24.0.5-1ubuntu1_amd64.deb ...
Unpacking libglx-mesa0:amd64 (24.0.5-1ubuntu1) over (24.2~git2406140600.39fdd2~oibaf~n) ...
dpkg: warning: downgrading libglapi-mesa:amd64 from 24.2~git2406140600.39fdd2~oibaf~n to 24.0.5-1ubuntu1
Preparing to unpack .../10-libglapi-mesa_24.0.5-1ubuntu1_amd64.deb ...
Unpacking libglapi-mesa:amd64 (24.0.5-1ubuntu1) over (24.2~git2406140600.39fdd2~oibaf~n) ...
dpkg: warning: downgrading libxatracker2:amd64 from 24.2~git2406140600.39fdd2~oibaf~n to 24.0.5-1ubuntu1
Preparing to unpack .../11-libxatracker2_24.0.5-1ubuntu1_amd64.deb ...
Unpacking libxatracker2:amd64 (24.0.5-1ubuntu1) over (24.2~git2406140600.39fdd2~oibaf~n) ...
dpkg: warning: downgrading mesa-vulkan-drivers:amd64 from 24.2~git2406140600.39fdd2~oibaf~n to 24.0.5-1ubuntu1
Preparing to unpack .../12-mesa-vulkan-drivers_24.0.5-1ubuntu1_amd64.deb ...
Unpacking mesa-vulkan-drivers:amd64 (24.0.5-1ubuntu1) over (24.2~git2406140600.39fdd2~oibaf~n) ...
Setting up libglapi-mesa:amd64 (24.0.5-1ubuntu1) ...
Setting up libdrm-common (2.4.120-2build1) ...
Setting up libdrm2:amd64 (2.4.120-2build1) ...
Setting up libdrm-amdgpu1:amd64 (2.4.120-2build1) ...
Setting up mesa-vulkan-drivers:amd64 (24.0.5-1ubuntu1) ...
Setting up libdrm-nouveau2:amd64 (2.4.120-2build1) ...
Setting up libgbm1:amd64 (24.0.5-1ubuntu1) ...
Setting up libdrm-radeon1:amd64 (2.4.120-2build1) ...
Setting up libdrm-intel1:amd64 (2.4.120-2build1) ...
Setting up libgl1-mesa-dri:amd64 (24.0.5-1ubuntu1) ...
Setting up libxatracker2:amd64 (24.0.5-1ubuntu1) ...
Setting up libegl-mesa0:amd64 (24.0.5-1ubuntu1) ...
Setting up libglx-mesa0:amd64 (24.0.5-1ubuntu1) ...
Processing triggers for libc-bin (2.39-0ubuntu8.2) ...
PPA purged successfully

5- make sure mesa got downgraded:
$ apt list mesa-vulkan-drivers

Listing... Done
mesa-vulkan-drivers/noble,now 24.0.5-1ubuntu1 amd64 [installed]

6- Finally make sure the new help message prints correctly:
$ ppa-purge

Warning: Required ppa-name argument was not specified
Usage: sudo ppa-purge [options] <ppa:ppaowner>[/ppaname]

ppa-purge will reset all packages from a PPA to the standard
versions released for your distribution.

Options:
 -p [ppaname] PPA name to be disabled (default: ppa)
 -o [ppaowner] PPA owner
 -s [host] Repository server (default: ppa.launchpadcontent.net)
 -d [distribution] Override the default distribution choice.
 -y Pass -y --force-yes to apt-get or -y to aptitude
 -i Reverse preference of apt-get upon aptitude.
 -h Display this help text

Example usage commands:
 sudo ppa-purge -o xorg-edgers
 will remove https://launchpad.net/~xorg-edgers/+archive/ppa

 sudo ppa-purge -o sarvatt -p xorg-testing
 will remove https://launchpad.net/~sarvatt/+archive/xorg-testing

 sudo ppa-purge [ppa:]ubuntu-x-swat/x-updates
 will remove https://launchpad.net/~ubuntu-x-swat/+archive/x-updates

Notice: If ppa-purge fails for some reason and you wish to try again,
(For example: you left synaptic open while attempting to run it) remove
the line "Enabled: no" from the Components section in the PPA ".sources"
file or uncomment the PPA from its ".list" file, run apt-get update and
try again.

7- This confirms that the patch works as expected on Noble