"Unmet dependencies" When trying to install KDE Plasma 5.3 on Ubuntu 15.04

I'm trying to install the latest KDE Plasma here but I'm getting

You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
kde-telepathy-minimal:
  Depends: kde-config-telepathy-accounts (>= 0.9.0) but it is not installed
E: Unmet dependencies. Try using -f.

and when I sudo apt-get -f install as specified and I say Y to getting 122KB of archives I get:

Preparing to unpack .../kde-config-telepathy-accounts_15.04.0-0ubuntu1~ubuntu15.04~ppa1_amd64.deb ...
Unpacking kde-config-telepathy-accounts (15.04.0-0ubuntu1~ubuntu15.04~ppa1) ...
dpkg: error processing archive /var/cache/apt/archives/kde-config-telepathy-accounts_15.04.0-0ubuntu1~ubuntu15.04~ppa1_amd64.deb (--unpack):
 trying to overwrite '/usr/share/accounts/services/facebook-im.service', which is also in package account-plugin-facebook 0.12+15.04.20150415.1-0ubuntu1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
 /var/cache/apt/archives/kde-config-telepathy-accounts_15.04.0-0ubuntu1~ubuntu15.04~ppa1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

And whenever I try to install any other package now I get the same thing. What should I do?

Fixed it by:

sudo dpkg -P unity-scope-gdrive account-plugin-google account-plugin-facebook
sudo apt-get install -f

This removes the packages listed in the first command and thus resolves the package conflict.

By default, the package manager refuses to overwrite files that also appear in other installed packages (whether the file is actually there or not), which is a sane decision to not inadvertently corrupt packages. In your case, this means, that the packages are incompatible. I can see that one seems to come from a PPA, so you should write to the maintainer of that PPA to investigate the issue.

Meanwhile, since the conflicting file is only and icon, it's pretty safe to override the package manager's decision with --force-overwrite:

cd /tmp
apt-get download kde-config-telepathy-accounts
sudo dpkg -i --force-overwrite kde-config-telepathy-accounts_*.deb
sudo apt-get install -f