Here's the problem. I tried to install a .deb for an epson scanner (http://download.ebz.epson.net/dsc/search/01/search/searchModule) and did accidentally installed the i386 instead of the amd64 version.
Now I get the following issue. The same issue crops up if I try to uninstall or purge using dpkg too!
sudo apt-get autoremove [sudo] password for ***: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: iscan-plugin-gt-x770 : Depends: iscan (>= 2.16.1) but it is not installable iscan-plugin-gt-x820 : Depends: iscan (>= 2.22.0) but it is not installable E: Unmet dependencies. Try using -f. ➜ ~ sudo apt-get install -f Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following packages were automatically installed and are no longer required: ... libreoffice-java-common...linux-image-extra-3.11.0-13-generic linux-image-extra-3.11.0-14-generic linux-image-extra-3.11.0-15-generic lp-solve openjdk-7-jre-lib swig swig2.0 Use 'apt-get autoremove' to remove them. The following packages will be REMOVED: iscan-plugin-gt-x770 iscan-plugin-gt-x820 0 upgraded, 0 newly installed, 2 to remove and 3 not upgraded. After this operation, 926 kB disk space will be freed. Do you want to continue [Y/n]? y (Reading database ... 693386 files and directories currently installed.) Removing iscan-plugin-gt-x770 ... /var/lib/dpkg/info/iscan-plugin-gt-x770.prerm: 4: /var/lib/dpkg/info/iscan-plugin-gt-x770.prerm: iscan-registry: not found dpkg: error processing iscan-plugin-gt-x770 (--remove): subprocess installed pre-removal script returned error exit status 127 No apport report written because MaxReports is reached already /var/lib/dpkg/info/iscan-plugin-gt-x770.postinst: 4: /var/lib/dpkg/info/iscan-plugin-gt-x770.postinst: iscan- registry: not found Removing iscan-plugin-gt-x820 ... /var/lib/dpkg/info/iscan-plugin-gt-x820.prerm: 4: /var/lib/dpkg/info/iscan-plugin- gt-x820.prerm: iscan-registry: not found dpkg: error processing iscan-plugin-gt-x820 (--remove): subprocess installed pre-removal script returned error exit status 127 No apport report written because MaxReports is reached already /var/lib/dpkg/info/iscan-plugin-gt-x820.postinst: 4: /var/lib/dpkg/info/iscan-plugin-gt-x820.postinst: iscan- registry: not found Errors were encountered while processing: iscan-plugin-gt-x770 iscan-plugin-gt-x820 E: Sub-process /usr/bin/dpkg returned an error code (1)