package xserver-xorg-video-radeon 1:18.0.1-1 failed to install/upgrade: tentative de remplacement de « /usr/share/X11/xorg.conf.d/10-radeon.conf », qui appartient aussi au paquet xserver-xorg-video-ati 1:18.0.99+git1809140020.2d58830~b~padoka0

Got this error randomly after an upgrade (not sure if it was after adding the Ubuntu-x-swat PPA or because of a previous upgrade of Mesa from the Ubuntu repos). Looks like there's a package issue with two xorg packages (ati and radeon) having a common config file.

Using Ubuntu (MATE) 18.04.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: xserver-xorg-video-radeon 1:18.0.1-1
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Tue Sep 18 12:14:39 2018
DistUpgraded: 2018-04-27 11:05:22,902 ERROR got error from PostInstallScript ./xorg_fix_proprietary.py (g-exec-error-quark: L’exécution du processus fils « ./xorg_fix_proprietary.py » a échoué (Aucun fichier ou dossier de ce type) (8))
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 5.2.10, 4.15.0-33-generic, x86_64: installed
 virtualbox, 5.2.10, 4.15.0-34-generic, x86_64: installed
ErrorMessage: tentative de remplacement de « /usr/share/X11/xorg.conf.d/10-radeon.conf », qui appartient aussi au paquet xserver-xorg-video-ati 1:18.0.99+git1809140020.2d58830~b~padoka0
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X] [1002:683d] (prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Cape Verde XT [Radeon HD 7770/8760 / R7 250X] [1458:2556]
MachineType: Gigabyte Technology Co., Ltd. GA-880GM-UD2H
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-34-generic root=UUID=a7fa7861-a59a-4ae7-a396-d409348839be ro quiet splash vt.handoff=1
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: xserver-xorg-video-ati
Title: package xserver-xorg-video-radeon 1:18.0.1-1 failed to install/upgrade: tentative de remplacement de « /usr/share/X11/xorg.conf.d/10-radeon.conf », qui appartient aussi au paquet xserver-xorg-video-ati 1:18.0.99+git1809140020.2d58830~b~padoka0
UpgradeStatus: Upgraded to bionic on 2018-04-27 (148 days ago)
dmi.bios.date: 10/11/2010
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F8
dmi.board.name: GA-880GM-UD2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF8:bd10/11/2010:svnGigabyteTechnologyCo.,Ltd.:pnGA-880GM-UD2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-880GM-UD2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-880GM-UD2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.1.5-1ubuntu1~18.04.0~ppa1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.1.5-1ubuntu1~18.04.0~ppa1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2