解决ubuntu系统中输入sudo passwd root,之后，提示输入新密码时，输不进去

能输入的，只是这个输入是不回显的，Windows平台下，在输入框输入密码就会显示*或远点，但是Linux里面输入很对都是不回显的，你不用担心，继续输入好了

root@iZ51bcrug2kaiwZ:~# sudo adduser lixiang
Adding user `lixiang' ...
Adding new group `lixiang' (1000) ...
Adding new user `lixiang' (1000) with group `lixiang' ...
Creating home directory `/home/lixiang' ...
Copying files from `/etc/skel' ...
Enter new UNIX password: 
Retype new UNIX password: 
Sorry, passwords do not match
passwd: Authentication token manipulation error
passwd: password unchanged
Try again? [y/N] y
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
Changing the user information for lixiang
Enter the new value, or press ENTER for the default
	Full Name []: 
	Room Number []: 
	Work Phone []: 
	Home Phone []: 
	Other []: 
Is the information correct? [Y/n] y
root@iZ51bcrug2kaiwZ:~#