Hot answers tagged upgrade
I doubt there is a perfect method. A method could be to check the date of creation of the filesystem: sudo tune2fs -l /dev/sda1 | grep 'Filesystem created:' Filesystem created: Thu Mar 5 15:51:50 2015 The system I pulled this from was created on March 5th 2015. Of course it is entirely possible to install 14.10 on March the 5th and then upgrade ...
Not water-proof but another possibility, if the entry was not removed: $ grep cdrom /etc/apt/sources.list # deb cdrom:[Ubuntu-GNOME 15.10 _Wily Werewolf_ - Release amd64 (20151021)]/ wily main multiverse restricted universe That means, you probably have installed your system with a Wily DVD.
You don't need to upgrade. Specify the standards version to g++. For example, to compile an example program from cppreference.com: $ g++ --version g++ (Ubuntu 4.8.5-2ubuntu1~14.04.1) 4.8.5 Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or ...
In General It is not recommended and therefore not possible to change the python version of your system (i.e. with apt-get update python), since many scripts rely on a specific version. You can brake your system and it may cause problems with future updates. Instead, you may want to have a look at virtual environments as answered here. If you are searching ...
You might want to look at: Install Ubuntu without CD and USB , how? and at the official installation guide, they have a part about your situation under installation with no CD: https://help.ubuntu.com/community/Installation To the editors: this should probably be a comment and not an answer.
sudo apt-get install --reinstall ubuntu-desktop merely reinstalls the Unity Desktop Environment, not Ubuntu itself. If you want to completely reinstall Ubuntu, you will need either a DVD or USB stick that is at least 4GB (2GB will probably work, but use something higher to be safe). There is a network boot option, where you can install Ubuntu from a network ...
On the mailinglist, one of the Sage developers mentioned that this is a known issue with 7.0 and should be fixed soon. That was posted on 2016-02-04. It appears that it has since been fixed with the 7.0~aimsppa1~qa201602060140061 release, (i.e. on 2016-02-06). I just ran apt-get update && apt-get upgrade and this problem was indeed fixed.
Since you didn't update the package manager's view of your system when you "manually reverted to an old version of thunderbird", it thinks you're running the current version. Rather than trying to tell the package management system about your old version, you could simply reinstall the current version with: sudo apt-get install --reinstall thunderbird ...
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