I can't do "sudo"

Posted by Klevin92 on Ask Ubuntu See other posts from Ask Ubuntu or by Klevin92
Published on 2011-12-07T00:51:30Z Indexed on 2012/04/01 23:40 UTC
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password

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gksu

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su

Let's describe it from the beginning:
I was planning to re-enable the password requirement in LightDM for security reasons. But, since my PC's been sluggish these times, it FC'd the password setup when I was entering and now I can't enter it even with combinatorics. I have followed the tips in the Help page, but with all of them I have issues:

I try to enter recovery mode (so that I type passwd and my name and change it), but it is a black screen just like my boot screen (because of nVidia graphic card compatibility issue), then I can't do anything
I also tried the editting "shadow" file, but the guide talks about some commas that I just don't see where they are supposed to be.
I even tried deletting the keyring file like it's said, but nothing happens (except that I lose the other passwords)

So is there anything I can do to have my password back? (a bonus would be stopping all this sluggish, apps not responding, etc)

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