This packaging error has been reported against xenial, bionic, and focal (see duplicate bugs) including the latest version in focal-updates.
ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libsane 1.0.25+git20150528-1ubuntu2.16.04.1 [modified: lib/udev/rules.d/60-libsane.rules]
ProcVersionSignature: Ubuntu 4.13.0-41.46~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-41-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.17
Architecture: amd64
Date: Sat May 12 05:51:17 2018
DuplicateSignature:
package:libsane:1.0.25+git20150528-1ubuntu2.16.04.1 [modified: lib/udev/rules.d/60-libsane.rules]
Unpacking libsane:i386 (1.0.25+git20150528-1ubuntu2.16.04.1) ...
dpkg: error processing archive /var/cache/apt/archives/libsane_1.0.25+git20150528-1ubuntu2.16.04.1_i386.deb (--unpack):
trying to overwrite shared '/lib/udev/rules.d/60-libsane.rules', which is different from other instances of package libsane:i386
ErrorMessage: trying to overwrite shared '/lib/udev/rules.d/60-libsane.rules', which is different from other instances of package libsane:i386
InstallationDate: Installed on 2018-03-12 (60 days ago)
InstallationMedia: Xubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
RelatedPackageVersions:
dpkg 1.18.4ubuntu1.4
apt 1.2.26
SourcePackage: sane-backends
Title: package libsane 1.0.25+git20150528-1ubuntu2.16.04.1 [modified: lib/udev/rules.d/60-libsane.rules] failed to install/upgrade: trying to overwrite shared '/lib/udev/rules.d/60-libsane.rules', which is different from other instances of package libsane:i386
UpgradeStatus: No upgrade log present (probably fresh install)
Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.