apt-get dist-upgrade
does not upgrade the OS to the latest release. It acts very much like apt-get update
, in addition to handling changing dependencies with new versions of packages.
If you want to upgrade to a new release, use do-release-upgrade
instead. (I recommend you first switch to runlevel 1 with init 1
, however.)
Relevant excerpt from the manual:
upgrade
upgrade is used to install the newest versions of all packages currently installed on
the system from the sources enumerated in /etc/apt/sources.list. Packages currently
installed with new versions available are retrieved and upgraded; under no
circumstances are currently installed packages removed, or packages not already
installed retrieved and installed. New versions of currently installed packages that
cannot be upgraded without changing the install status of another package will be left
at their current version. An update must be performed first so that apt-get knows that
new versions of packages are available.
dist-upgrade
dist-upgrade in addition to performing the function of upgrade, also intelligently
handles changing dependencies with new versions of packages; apt-get has a "smart"
conflict resolution system, and it will attempt to upgrade the most important packages
at the expense of less important ones if necessary. The dist-upgrade command may
therefore remove some packages. The /etc/apt/sources.list file contains a list of
locations from which to retrieve desired package files. See also apt_preferences(5)
for a mechanism for overriding the general settings for individual packages.
EDIT
Following Nasreddine's comment, I looked into it further and it seems others have had the same problem as evidenced by this launchpad bug report. The 7th post by Andreas Tj seems to offer a plausible solution but I can't say whether it works, since I don't have this particular problem and thus can't test it.