Ordinary users in linux su root switch prompts what to do without files or directories

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1. First, enter single-user mode:

1)。 Ubuntu:

You can select the second fix in the grub interface, but there is no grub to refer to:

1. Restart ubuntu, and then press shirft to enter the grub menu

2. Select recovery mode and press the "e" key to enter the editing page, as follows:

The non-recovery models are:

3. Replace ro recovery nomodeset with "rw single init=/bin/bash" (the interface above will be changed to rw single init=/bin/bash)

4. Press ctrl+x to enter single-user mode, and the current user is root.

2) Fedora 23 (virtual machine)

After entering grub, press e to enter edit mode. Find the line that starts with "linux" and append "rw single init=/bin/bash".

Press ctrl+x to start, and then enter the shell environment of root.

two。 Modify the shell of the user login.

Vim? / etc/passwd

Shell column is root or does not exist

Modified to: root:x:0:0:root:/root:/bin/bash.

Explanation: user name: password: user identification number: group identification number: annotative description: home directory: login Shell

Two zeros indicate that the user is root and belongs to the root group, that is, administrator permissions.

3. Then ctrl+alt+delete restarts. Problem solved.

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