The complement of
apt-get install package is
apt-get remove package. To remove all associated settings too, you need to run
apt-get purge package.
Note that these commands rely on the uninstallation scripts provided with the package. All packages in the main repository I know of do their job of uninstalling very well. This may not be the case for third-party packages.
As for your driver issue, there are a few possibilities why installing a package broke your wireless driver:
- The driver has a post-installation hook which is executed when a condition is met, e.g. kernel updates
- The package overwrote a file that the wireless driver depended on
- The package in question was a kernel update but the driver does not have a post-installation hook for recompiling the driver (most likely)
As for the "System rollback" / "System Restore" features, the closest feature you'll get is a system image using software like Clonezilla. Unfortunately, this cannot be done within a running system and must be performed from a Live CD.