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When I logged in today on my laptop and tried to do something in konsole it asked me for my password. So i typed in my password like 100 times and it keeps on saying that It's incorrect. It worked yesterday and I know for sure I didn't change it. Is there any way to change it or make it work ? How do I reset a lost administrative password? doesn't work for me. I have toshiba chromebook 2 and I don't have bios so this method doesn't work ! When I type sudo su to get root access Its asking me for username password which doesn't work. I tried to do it in chrome os by pressing ctrl+alt+t and then shell this is what I get.

chronos@localhost / $ sudo passwd Enter new UNIX password: Retype new UNIX password: passwd: Authentication token lock busy passwd: password unchanged

so I tried different method. 

chronos@localhost / $ sudo su
localhost / # sudo passwd
Enter new UNIX password: 
Retype new UNIX password: 
passwd: Authentication token lock busy
passwd: password unchanged
localhost / # sudo passwd crazy_driver
passwd: unknown user crazy_driver
localhost / # passwd crazy_driver
passwd: unknown user crazy_driver

Again: chronos@localhost / $ sudo passwd crazy_driver passwd: unknown user crazy_driver

I don't know why would it say unknown user, maybe because Im not logged in to chroot ? but if i log in its asking for password before I get to make any changes.
Can anyone help me solve this problem ?

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Damian
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  • Please look at my answer about passwords here before starting with the complicated steps. Sometimes the solution is so easy that it is easy to oversee... If not, give me a ping and we will look what we can do. – Byte Commander Mar 24 '15 at 21:37
  • I tried all that before writing the question. Password worked since I set it up and today its wrong ?.There is no such thing like capslock or numlock in my keyboard either. – Damian Mar 24 '15 at 21:55
  • You don't need to have a BIOS for that answer. You hold [Shift] key after the BIOS/UEFI/manufacturer logo screen to make the GRUB menu appear (if you don't get into it by default). There you select "recovery mode" and proceed as described. Why should that do not work? – Byte Commander Mar 24 '15 at 22:55
  • Do you have chromebook too ? I press shift when developers mode is on and nothing and I press shift after that when chrome logo shows and still nothing. I don't think it works on my chromebook – Damian Mar 25 '15 at 20:50
  • No, no Chromebook. That's strange... Can't you see any possibility to enter GRUB menu? You might check out how to reconfig GRUB from within Ubuntu to unhide the boot menu... But you would need sudo for that :P - so you might have to boot a live Ubuntu and chroot into your installation. – Byte Commander Mar 25 '15 at 22:11
  • so basically I would have to reinstall ubuntu ? – Damian Mar 25 '15 at 23:26
  • NO! Just boot from a live DVD or USB stick (you would also use to reinstall it) and select "Try Ubuntu" instead of "Install...". Mount the partition you actually have Ubuntu installed on and access the GRUB config file /etc/default/grub. Note that this is not the absolute path, but the relative one to the partition mountpoint! Do not access the one of the life system - that would be useless. Google for the HIDDEN_TIMEOUT options, I am not sure how exactly that worked. Set it up so that you will see the GRUB menu at boot. – Byte Commander Mar 25 '15 at 23:49

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