First reboot/reset your system to GRUB2 boot loader menu.
Find the line which starts with "linux". Navigate to the end of the line and add:
init=/bin/bash
Once you have changed boot options as indicated in the previous step press F10 to instruct your Ubuntu system to boot.
Your system will boot and you will be provided with root command line prompt.
Once you get to the command line prompt enter the following commands:
mount -o remount,rw /
passwd
reboot -f
Ref :- http://linuxconfig.org/ubuntu-14-04-lost-password-recovery
Find the line which starts with "linux". Navigate to the end of the line and add:
init=/bin/bash
Once you have changed boot options as indicated in the previous step press F10 to instruct your Ubuntu system to boot.
Your system will boot and you will be provided with root command line prompt.
Once you get to the command line prompt enter the following commands:
mount -o remount,rw /
passwd
reboot -f
Ref :- http://linuxconfig.org/ubuntu-14-04-lost-password-recovery
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