在给定的终端窗口中，某些命令开始始终失败：
$ sudo apt-get install ipython
...
After this operation, 3,826 kB of additional disk space will be used.
Do you want to continue? [Y/n] Abort.
$
$ kinit -f <username>
Password for <username>@<domain>:
kinit: Pre-authentication failed: Cannot read password while getting initial credentials
$
$ passwd
Changing password for <username>.
(current) UNIX password:
passwd: Authentication token manipulation error
passwd: password unchanged
$
$ crontab -e
Too many errors from stdincrontab: "/usr/bin/sensible-editor" exited with status 1
$
$ sudo docker …