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ubuntu忘记密码
Do these two things just to make sure:
mount -o remount,rw /
This first part remounts the root partition as read/write since it was only in read mode. It actually dismounts the root partition and then mounts it again as read/write.
Then do this:
chmod 640 /etc/shadow
Then do the sudo passwd USER
. It should work after that. This part gives the correct permissions to the shadow file.
ubuntu忘记密码
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