In order to install tmux 2.1, I needed to install
libtinfo5 version 6, I did this by downloading a .deb archive containing
libtinfo5 and installing directly with command:
sudo dpkg -i libtinfo5_6.0+20160213-1ubuntu1_amd64.deb
This satisfied tmux 2.1's dependency and tmux installed ok.
Now I tried to install vnstat using
sudo apt-get install vnstat
apt-get error exited with the following
$ sudo apt-get install vnstat 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: libncurses5 : Depends: libtinfo5 (= 5.9+20150516-2ubuntu1) but 6.0+20160213-1ubuntu1 is to be installed libncursesw5 : Depends: libtinfo5 (= 5.9+20150516-2ubuntu1) but 6.0+20160213-1ubuntu1 is to be installed E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
My understanding has always been that Ubuntu's package management system was capable of installing and managing multiple versions of the same package, for situations exactly like this. In other words apt/dpkg recognises
tmuxneeds libtinfo5 -
version 6to work
vnstatneeds libtinfo5 -
version 5to work
Then apt/dpkg say's ok, I'll install both versions.
I can see how certain programs like a system binary, e.g.
ls can only be installed once as most invocations simply say
bash -c "<command>" and not
bashv.3.2 -c "<command>".
So my question is can the package manager install and manage multiple dependencies?, or is this just not possible because, like in the bash example above, most programs make a call to the dependency by the dependencies name without specifying version. In which case the issue is beyond the control of the package manager (i.e. its more of a programming compilation/configuration/organisation issue) and the package manager gives up at that point?