apt not upgrading package

[Tony Arnold]

Colin,

On Sun, 2016-06-05 at 08:13 +0100, Colin Law wrote:

On 5 June 2016 at 06:32, Nils Kassube <kassube at gmx.net<mailto:kassube at gmx.net>> wrote:


Colin Law wrote:


I have added a ppa for mosquitto, when I run
sudo apt-get update && sudo apt-get dist-upgrade
it says:
0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
but apt-cache policy for mosquitto shows:
$ apt-cache policy mosquitto
mosquitto:
  Installed: 1.4.8-1build1
  Candidate: 1.4.9-0mosquitto1
  Version table:
     1.4.9-0mosquitto1 500
        500
http://ppa.launchpad.net/mosquitto-dev/mosquitto-ppa/ubuntu
xenial/main amd64 Packages
 *** 1.4.8-1build1 500
        500 http://gb.archive.ubuntu.com/ubuntu xenial/universe amd64
Packages 100 /var/lib/dpkg/status

Which says there is a candidate for update.  I cannot see why apt-get
does not offer the upgrade.  If mosquitto were held then I think
apt-get would show it as held back.  Any suggestions as to what is
going on?



Could it be that one of the dependencies for the new version is missing?



I see the cause now, I tried
sudo apt-get -s install mosquitto
and got
The following packages have unmet dependencies.
 mosquitto : Depends: libwebsockets3 (>= 1.2) but it is not installable

So now I can investigate why.
It is not very clever of apt-get to not give any indication that there
is a problem with the upgrade.  I also tried
sudo apt upgrade && sudo apt full-upgrade
and in this case the upgrade said that there is an upgradable package,
though the full-upgrade still did not give any indication of problems.
However at least there is some advantage to using apt rather than
apt-get.



I tend to use aptitude to install and upgrade stuff on my systems. I think it is better at highlighting dependency issues. It even offers solutions to resolve them. I also use the safe-upgrade option rather than dist-upgrade, but I'm not really sure of the differences.

Regard,
Tony.
--
Tony Arnold | IT Security Analyst | University of Manchester | IT Services | T: +44 (0) 161 275 6093 | M: +44 (0) 773 330 0039 | E: tony.arnold at manchester.ac.uk
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