root@vagrant-ubuntu-trusty-64:/home/vagrant# aptitude install ubuntu-mate-core
The following NEW packages will be installed:
  ...
0 packages upgraded, 660 newly installed, 0 to remove and 0 not upgraded.
Need to get 230 MB of archives. After unpacking 779 MB will be used.
The following packages have unmet dependencies:
 caja : Depends: libglib2.0-0 (>= 2.41.1) but 2.40.2-0ubuntu1 is installed.
 mate-desktop-environment-core : Depends: mate-themes (>= 3) but it is not going to be installed.
 ubuntu-mate-core : Depends: grub2-themes-ubuntu-mate which is a virtual package.
                    Depends: mate-gnome-main-menu-applet which is a virtual package.
                    Depends: mate-media-pulse which is a virtual package.
                    Depends: mate-settings-daemon-pulse which is a virtual package.
                    Depends: plymouth-theme-ubuntu-mate-logo which is a virtual package.
                    Depends: plymouth-theme-ubuntu-mate-text which is a virtual package.
                    Depends: ubuntu-mate-artwork which is a virtual package.
                    Depends: ubuntu-mate-default-settings which is a virtual package.
                    Depends: ubuntu-mate-lightdm-theme which is a virtual package.
 openntpd : Conflicts: ntp but 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 is to be installed.
The following actions will resolve these dependencies:

     Keep the following packages at their current version:
1)     caja [Not Installed]
2)     mate-desktop-environment-core [Not Installed]
3)     ntp [Not Installed]
4)     ubuntu-mate-core [Not Installed]

     Leave the following dependencies unresolved:
5)     mate-session-manager recommends caja


Accept this solution? [Y/n/q/?] q
Abandoning all efforts to resolve these dependencies.
Abort.
root@vagrant-ubuntu-trusty-64:/home/vagrant# aptitude install ubuntu-mate-desktop
The following NEW packages will be installed:
  ...
0 packages upgraded, 999 newly installed, 0 to remove and 0 not upgraded.
Need to get 487 MB of archives. After unpacking 1,853 MB will be used.
The following packages have unmet dependencies:
 caja : Depends: libglib2.0-0 (>= 2.41.1) but 2.40.2-0ubuntu1 is installed.
 ubuntu-mate-desktop : Depends: mate-menu which is a virtual package.
                       Depends: mate-netspeed which is a virtual package.
 mate-system-monitor : Depends: libgtk-3-0 (>= 3.11.5) but 3.10.8-0ubuntu1.6 is installed.
 mate-notification-daemon : Depends: libgtk-3-0 (>= 3.11.5) but 3.10.8-0ubuntu1.6 is installed.
 libgpod4 : Conflicts: libgpod4-nogtk but 0.8.3-4ubuntu3 is to be installed.
 libgpod4-nogtk : Conflicts: libgpod4 but 0.8.3-4ubuntu3 is to be installed.
 systemd : Conflicts: systemd-shim but 6-2bzr1 is installed.
The following actions will resolve these dependencies:

      Keep the following packages at their current version:
1)      caja [Not Installed]
2)      libgpod4-nogtk [Not Installed]
3)      mate-notification-daemon [Not Installed]
4)      mate-power-manager [Not Installed]
5)      mate-system-monitor [Not Installed]
6)      systemd [Not Installed]
7)      ubuntu-mate-desktop [Not Installed]

      Leave the following dependencies unresolved:
8)      mate-session-manager recommends caja
9)      mate-screensaver recommends mate-power-manager
10)     mate-applets recommends mate-system-monitor


Accept this solution? [Y/n/q/?] q
Abandoning all efforts to resolve these dependencies.
Abort.