虚拟机vwmare ubuntu 18 重置密码

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原文链接：https://linuxconfig.org/how-to-reset-lost-root-password-on-ubuntu-18-04-bionic-beaver-linux

文章标签：

#ubuntu #linux #运维

本文提供了一种简单的方法来解决Ubuntu 18.04中丢失root密码的问题，通过GRUB菜单编辑、进入单用户模式并重置密码，适用于物理机或虚拟机环境。

网上有很多的我试了都不行，在外网找到一个资料，一次就可以了。

https://linuxconfig.org/how-to-reset-lost-root-password-on-ubuntu-18-04-bionic-beaver-linux

How to reset lost root password on Ubuntu 18.04 Bionic Beaver Linux

27 May 2020 by Lubos Rendek

Objective

The objective is to reset lost root or user password on Ubuntu 18.04 Bionic Beaver Linux.

Operating System and Software Versions

Operating System: – Ubuntu 18.04 Bionic Beaver

Requirements

Physical access to your computer or virtual machine with the Ubuntu 18.04 Bionic Beaver installation is required.

Conventions

# – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
$ – requires given linux commands to be executed as a regular non-privileged user

Instructions

Boot Into GRUB menu

The first step is to reboot into the GRUB menu. If Ubuntu 18.04 Bionic Beaver is the only operating system installed you need to keep pressing SHIFT for the GRUB menu to show up.

Edit Grub Menu

Using arrows select the Ubuntu menu or the menu you use to boot your system and hit the e key. This will allow you to edit the menu:

Navigate down with the arrow-down key until you can see a line ending with:

ro   quiet splash $vt_handoff

Using your keyboard replace the following keywords.
FROM:

ro   quiet splash $vt_handoff

TO:

rw init=/bin/bash

Once you have made the change press F10 or CTRL + x to perform boot into a single mode.

Reset password

Confirm that your system partition is mounted as read/write (rw):

# mount | grep -w /

If all good, reset your root password with the passwd command:

# passwd

Alternatively, you can reset your user password. The following linux command will reset the password for the linuxconfig user:

# passwd linuxconfig

Reboot

Your root password is now reset. Reboot your system:

# exec /sbin/init

Troubleshooting

Enter new UNIX password:
Retype new UNIX password:
passwd: Authentication token manipulation error
passwd: password unchanged

Your root partition is mounted read-only. Try:

# mount -o remount,rw /

to resolve this issue.

[ end Kernel panic - not syncing: Attempted to kill init! exit code=0x0007f00

Make sure that you removed the splash boot option when editing the grub’s menu item.

When trying to reboot with the reboot command I get:

Failed to connect to bus: No such file or directory
Failed to talk to init daemon.

Ignore, and reboot with:

# exec /sbin/init