I am now using ubuntu 12.04. I have problem with login. It wait me for log time even though I have enter right password.And nothing happen after waiting. I try to login from guest account but same problem occur with guest account.
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enter via recovery mode and make sure your computer is up to date, do the following commands to upgrade the software. This could resolve the issue because this sounds like a bug to me.
sudo apt-get update && sudo apt-get dist-upgrade
dist-upgrade install new kernels it doesn't upgrade the system to a new release of Ubuntu.
If this doesn't work, then I would upgrade to 14.04, because I think this is a bug and newer software most likely wont have this issue.
I would start by downloading Ubuntu 14.04 and put it on a USB(live-usb) and boot from it. You can upgrade your current installation from there and you don't have to make a fresh install. This involves less risk than by upgrading via do-release-upgrade form the terminal because you already have all the necessary files on your USB.
But I would also make a backup of all your files first, or those you can't lose.
Here are some alternatives on how to backup your files, there are others but these are the ones I would try.
- live-usb
Boot the USB -> try Ubuntu -> mount the partition -> backup the files. - graphical via the network
via the network when the computer is running, network -> your computer -> log in with user/password if you have installed and configured this (your home folder needs to be shared with the network for this to work). - SSH
copy the files via ssh to another device/computer
Good luck!
Alvar
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