How to uninstall nvidia-kernel-2.6.26-2-openvz-amd64 from Ubuntu
To uninstall just nvidia-kernel-2.6.26-2-openvz-amd64 package itself from Ubuntu execute on terminal:
sudo apt-get remove nvidia-kernel-2.6.26-2-openvz-amd64
Uninstall nvidia-kernel-2.6.26-2-openvz-amd64 and it's dependent packages
To uninstall the nvidia-kernel-2.6.26-2-openvz-amd64 package and any other dependant package which are no longer needed on Ubuntu.
sudo apt-get autoremove nvidia-kernel-2.6.26-2-openvz-amd64
If you also want to delete configuration and/or data files of nvidia-kernel-2.6.26-2-openvz-amd64 from Ubuntu then this will work:
sudo apt-get purge nvidia-kernel-2.6.26-2-openvz-amd64
To delete configuration and/or data files of nvidia-kernel-2.6.26-2-openvz-amd64 and it's dependencies from Ubuntu then execute:
sudo apt-get autoremove --purge nvidia-kernel-2.6.26-2-openvz-amd64
nvidia-kernel-2.6.26-2-openvz-amd64 package information
NVIDIA binary kernel module for Linux 2.6.26-2-openvz-amd64
These Xorg binary drivers provide optimized hardware acceleration of OpenGL applications via a direct-rendering X Server and support the GeForce (>2), nForce and Quadro chipsets. AGP and flat panel displays are also supported. This package contains the NVIDIA binary kernel module needed by nvidia-glx. For more information on this source package visit NVIDIA's homepage at http://www.nvidia.com/ .
More information about apt-get remove
Advanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.
apt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.
apt-get remove is identical to install except that packages are removed instead of installed. Note that removing a package leaves its configuration files on the system. If a plus sign is appended to the package name (with no intervening space), the identified package will be installed instead of removed.