Auto refresh to Core20 #1856, $passwd not works properly

[Soar Huang]

After auto refreshing core20 from #1832 to #1856,
observe the new core20 #1856 cannot run `$passwd` properly anymore.

Reported on Core20 GitHub as well
https://github.com/snapcore/core20/issues/143

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iotuc@ubuntu:~$ passwd iotuc
Changing password for iotuc.
(current) UNIX password:
New password:
/var/cache/cracklib/cracklib_dict.pwd.gz: No such file or directory
BAD PASSWORD: The password fails the dictionary check - error loading dictionary
New password:
/var/cache/cracklib/cracklib_dict.pwd.gz: No such file or directory
BAD PASSWORD: The password fails the dictionary check - error loading dictionary
New password:
/var/cache/cracklib/cracklib_dict.pwd.gz: No such file or directory
BAD PASSWORD: The password fails the dictionary check - error loading dictionary

passwd: Have exhausted maximum number of retries for service
passwd: password unchanged

iotuc@ubuntu:~$
iotuc@ubuntu:~$ snap changes
ID Status Spawn Ready Summary
4 Done 4 days ago, at 04:42 UTC 4 days ago, at 04:44 UTC Auto-refresh snap "core20"

iotuc@ubuntu:~$
iotuc@ubuntu:~$ snap list
Name Version Rev Tracking Publisher Notes
core20 20230308 1856 latest/stable canonical✓ base
kernel 5.4.0-1034.45.1 126 latest/edge canonical✓ kernel
network-manager 1.22.10-14 743 20/stable canonical✓ -
snapd 2.58.3 18600 latest/stable canonical✓ snapd
gadget 20-3 71 latest/edge/… OEM/ODM gadget
iotuc@ubuntu:~$

[Soar Huang (soarhuang)]

If run with `$sudo`, it could change successfully, but it will show up 'error loading dictionary'

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iotuc@ubuntu:~$ sudo passwd iotuc
New password:
/var/cache/cracklib/cracklib_dict.pwd.gz: No such file or directory
BAD PASSWORD: The password fails the dictionary check - error loading dictionary
Retype new password:
passwd: password updated successfully

[Soar Huang (soarhuang)]

Update

If we add system-user via cloud-init (cloud.conf) in gadget snap,
we cannot login the UC20 system if setting 'expire: True',
-----------------------------------------------------
#cloud-config
  ssh_pwauth: True
  users:
   - name: iotuc
     sudo: ALL=(ALL) NOPASSWD:ALL
     shell: /bin/bash
  chpasswd:
   list: |
    iotuc:iotuc
   expire: True
-----------------------------------------------------

It will show below error message as well

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New password:
/var/cache/cracklib/cracklib_dict.pwd.gz: No such file or directory
BAD PASSWORD: The password fails the dictionary check - error loading dictionary
-----------------------------------------------------