This question already has an answer here:
I'm new to the Linux world but decided to try Ubuntu and so far I like it.
But after installing the ATI driver a weird thing occured. Whenever I turn on my laptop, it starts normally up to the part where I can choose the OS I'd like to boot (with purple background) and when I hit Enter to boot the Ubuntu, it just beeps and stays black, nothing happens.
I tried to find a solution but got nothing so far.
When I boot in recovery mode (root) and try to purge the driver, 3 lines appear :
W: Not using locking for read only lock file /var/lib/dpkg/lock E: Unable to write to /var/cache/apt/ E: The package lists or status file could not be parsed or opened.
It's like that will all commands I try.
I'd really like to use Ubuntu and maybe at some point I'll remove Windows entirely but for now it's just unusable.
I have a request, if someone replies, please try to explain everything step by step since I'm new to this.
P.S. I am really sorry if there is already a post answering to this.