Upgraded to 14.04 from 12.04. Not sure if the upgrade was complete; laptop Dell Inspiron 3542 was powered down in spite of connected to power source. However, when the machine was started, login screen appeared.

Users' names were present. When the earlier password was keyed in, a message appeared above the password box as: wrong password. Tried changing password thru root. No use. Noticed that Ctrl + Alt + F1 or Ctrl + Alt + T doesn't work - no change in the screen.

Would be thankful if a solution is provided here.

  • Could the password problem be an issue of keyboard layout? Can you log in to a guest session to see what layout is being used? – Zanna Oct 12 '18 at 21:29
  • Boot from a LiveUSB, enter the "Try Ubuntu" environment, mount your hard drive, and find the file /var/log/apt/term.log . The final line of that log should be "Log ended: <date> <time>" matching the date and time your release-upgrade completed successfully. If it's anything else, then your release-upgrade was interrupted by the poweroff and your system is truly broken. If your system is broken, then backup your data and reinstall. While a system broken during release-upgrade might be fixable, it also might not be fixable...depends upon what was happening when the poweroff occurred. – user535733 Oct 13 '18 at 0:02
  • Thanks a lot for response Found that problem was due to glitch during installation. So used LiveUSB16.04, copied the user files and installed OS. Thanks again. – Viji Swami Oct 19 '18 at 13:50

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