I installed Steam using Ubuntu Software Center, but when I tried to launch it, it says it needs additional packages.
The error in the terminal:
Steam needs to install these additional packages:
libgl1-mesa-dri-lts-quantal:i386, libgl1-mesa-glx-lts-quantal:i386
sudo: unable to change to sudoers gid: Operation not permitted
sudo: setresuid() [0, 0, 0] -> [115, -1, -1]: Operation not permitted
sudo: unable to change to sudoers gid: Operation not permitted
sudo: setresuid() [0, 0, 0] -> [115, -1, -1]: Operation not permitted
Press return to continue:
What am I supposed to do?