:~$ sudo apt-get install libdrm-nouveau2 libdrm-nouveau2:i386[sudo]
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libdrm-nouveau1a:i386 libllvm3.0:i386
Use 'apt-get autoremove' to remove them.
The following NEW packages will be installed:
  libdrm-nouveau2 libdrm-nouveau2:i386
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
10 not fully installed or removed.
Need to get 0 B/31.1 kB of archives.
After this operation, 179 kB of additional disk space will be used.
(Reading database ... 543711 files and directories currently installed.)
Unpacking libdrm-nouveau2 (from .../libdrm-nouveau2_2.4.39-0ubuntu0.1_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/libdrm-nouveau2_2.4.39-0ubuntu0.1_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/x86_64-linux-gnu/libdrm_nouveau.so.2.0.0', which is also in package libdrm-nouveau1a 2.4.40~precise~ppa1
Unpacking libdrm-nouveau2:i386 (from .../libdrm-nouveau2_2.4.39-0ubuntu0.1_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libdrm-nouveau2_2.4.39-0ubuntu0.1_i386.deb (--unpack):
 trying to overwrite '/usr/lib/i386-linux-gnu/libdrm_nouveau.so.2.0.0', which is also in package libdrm-nouveau1a:i386 2.4.40~precise~ppa1
Errors were encountered while processing:
 /var/cache/apt/archives/libdrm-nouveau2_2.4.39-0ubuntu0.1_amd64.deb
 /var/cache/apt/archives/libdrm-nouveau2_2.4.39-0ubuntu0.1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)