I'm receiving the same error upgrading Debian Testing. Upon searching the web for solutions I was led to this bug report. Here is what I'm getting in Testing:
dpkg: error processing archive /var/cache/apt/archives/libcomerr2_1.43.9-1_all.deb (--unpack): libcomerr2:all 1.43.9-1 (Multi-Arch: no) is not co-installable with libcomerr2 which has multiple installed instances Selecting previously unselected package libcom-err2:amd64. dpkg: considering deconfiguration of libcomerr2:amd64, which would be broken by installation of libcom-err2:amd64 ... dpkg: yes, will deconfigure libcomerr2:amd64 (broken by libcom-err2:amd64) (Reading database ... 318353 files and directories currently installed.) Preparing to unpack .../libcom-err2_1.43.9-1_amd64.deb ... De-configuring libcomerr2:amd64 (1.43.8-2) ... Unpacking libcom-err2:amd64 (1.43.9-1) ... Replacing files in old package libcomerr2:amd64 (1.43.8-2) ... Errors were encountered while processing: /var/cache/apt/archives/libcomerr2_1.43.9-1_all.deb E: Sub-process /usr/bin/dpkg returned an error code (1) 'apt --fix-broken install' returns the following: The following additional packages will be installed: libcomerr2 The following packages will be upgraded: libcomerr2 1 upgraded, 0 newly installed, 0 to remove and 230 not upgraded. 2 not fully installed or removed. Need to get 0 B/62.2 kB of archives. After this operation, 18.4 kB disk space will be freed. Do you want to continue? [Y/n] Retrieving bug reports... Done Parsing Found/Fixed information... Done Reading changelogs... Done dpkg: error processing archive /var/cache/apt/archives/libcomerr2_1.43.9-1_all.deb (--unpack): libcomerr2:all 1.43.9-1 (Multi-Arch: no) is not co-installable with libcomerr2 which has multiple installed instances Errors were encountered while processing: /var/cache/apt/archives/libcomerr2_1.43.9-1_all.deb E: Sub-process /usr/bin/dpkg returned an error code (1) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1749036 Title: package libcomerr2 1.43.8-2 failed to install/upgrade: libcomerr2:all 1.43.9-1 (Multi-Arch: no) is not co-installable with libcomerr2 which has multiple installed instances To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/1749036/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs