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Password change not taking effect in Ubuntu

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I'm trying to change the resolution on my VirtualBox VM running Ubuntu. I originally tried the simple way, running the command sudo apt-get install virtualbox-guest-dkms; however, upon being asked for my password, I got rejected despite being fairly certain I had the correct one. I tried changing my password two different ways on boot, one way through recovery mode and one via the instructions found on here. Both times I rebooted and attempted to once again run the sudo command, and both times the correct password did not work. No idea what I'm doing wrong and am getting frustrated trying to do something as simple as changing my screen resolution - please help!

ChanganAuto avatar
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Does the rejection explicitly says wrong password? If so it really is. You may think it's correct but if it includes special characters then likely it's due to a keyboard layout mismatch.
d4rkd3str0yer avatar
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It says "Sorry, try again.". I did the keystrokes exactly both times, and I even tried it without uppercase letters/special characters just in case my shift key was bound weirdly or something. No dice. @ChanganAuto
ChanganAuto avatar
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Another question: Does it work for logging in but not with sudo commands?
d4rkd3str0yer avatar
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It does not work for logging in either. Thankfully I am auto-logged in on startup but if I idle I cannot get back in without rebooting.
ChanganAuto avatar
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Thankfully no, it shouldn't be even in a VM. Something is wrong. You may try reinstalling.
d4rkd3str0yer avatar
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Crap, thank you for your help!
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