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6

First of all, never edit /etc/sudoers manually, always use visudo. Your problem was a syntax error in the file /etc/sudoers.d/90-cloudimg-ubuntu but it is now a malformed /etc/sudoers. So, to fix it (now that you have removed any changes you may have made), run pkexec visudo and make the file look like this: # # This file MUST be edited with the 'visudo' ...


2

You have quite a serious problem. The only official update server on your system seems to be the archive.canonical.com. All other servers listed above have been placed there manually after the inital system installation. The missing update server's name should be <country-code>.archive.ubuntu.com (for example us.archive.ubuntu.com) and it's not ...


1

There should be no trusty-security or trusty-updates entry for the extras repository. If you go to http://extras.ubuntu.com/ubuntu/dists/ in your web browser, you will see that trusty-security and trusty-updates are not listed. Run the following commands to fix the issue: sudo sed -i 's|deb http://extras.ubuntu.com/ubuntu trusty-security|#deb http://...


1

No package will typically be updated beyond the major version shipped with the initial release of the distribution. Minor updates may be released provided changes are not significant, and security fixes from newer versions may be back-ported to maintain compatibility. You will find that some packages independently offer newer major versions from their own ...


1

This has been fixed yesterday (2016/06/28) ; now you can install directly biber (it will install version 2.4; be sure to do an sudo apt-get update before). It will pull a lot of perl libraries, but it will not try to remove half of your LaTeX installation. [romano:~] % apt-cache policy biber biber: Installed: 2.4-1ubuntu1.16.04.1 Candidate: 2.4-...


1

If you are using the plasma-discover-updater (german:Aktualisierungsverwaltung) it is enough to tick on the package-name in the list, then the "changelog" of the package appears in a given field.


1

No. Automatic update is not supported by umake. You need to reinstall software when a new version becomes available (unless the software package itself has built in update functionality). Umake simply downloads the latest version available from the official websites and doesn't give you much option in terms of versioning (besides sometimes having a stable ...



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