I found out the hard way that a lot of websites on Linux are either out of date or give instructions that can ruin your system.
In trying to solve a black screen with Mint 17.2 I followed directions on adding a PPA to install Nvidia drivers and then remove the open source drivers. When I rebooted I still got the black screen and in recovery mode I could not log in because it said an ACL for a card was missing a file.
When I went to reinstall Mint it didn't want to overwrite the partition and wanted to create a new one alongside it. Forcing me to delete the Linux partition and start all over again.
A lot of websites just give wrong advice and if you aren't an advanced user who knows how to fix things when they break, you could be stuck with an unusable system.