MAAS machine commissioning fails in "20-dhcp-unconfigured-ifaces "

[Andreas]

Every time I try to comission new machines in (snap maas 3.4.1-14343-g.a552d2522 34087 3.4/stable canonical) (3 HPE Apollo Servers ProLiant X450 G9) it fails as seen below:

INFO: Discovered interfaces - eno49, eno50
INFO: Unconfigured IPv4 interfaces - eno50
INFO: Unconfigured IPv6 interfaces - eno49, eno50
INFO: Running dhclient -4 on eno50...
Traceback (most recent call last):
  File "/tmp/user_data.sh.gKV7h7/scripts/commissioning/20-maas-02-dhcp-unconfigured-ifaces", line 161, in <module>
    dhcp_explore()
  File "/tmp/user_data.sh.gKV7h7/scripts/commissioning/20-maas-02-dhcp-unconfigured-ifaces", line 102, in dhcp_explore
    call(["dhclient", "-nw", "-4", iface])
  File "/usr/lib/python3.12/subprocess.py", line 389, in call
    with Popen(*popenargs, **kwargs) as p:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/subprocess.py", line 1026, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.12/subprocess.py", line 1953, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'dhclient'

[Evan Ruffini (eruffini)]

Just adding some additional context - possible bug or compatibility issue with 24.04.

Ran into this problem with latest version of MAAS 3.4, and attempting to commission nodes with 24.04. Downgraded commissioning to 22.04 and it succeeded.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[David Torrey (dotj)]

Temporary workaround I used:

Create a custom commissioning script "10-maas-extra-packages" with the contents:

```
#!/bin/bash

apt update
apt -y install isc-dhcp-client
```

This gets executed prior to 20-maas-02-dhcp-unconfigured-ifaces, which then runs successfully.

[Christian (cboitel)]

I have the exact same issue with 3.6 but only when commissioning with 24.04 (noble).

[Christian (cboitel)]

oops same issue in 3.4.2

[Jacopo Rota (r00ta)]

This is a duplicate of https://bugs.launchpad.net/maas/+bug/2058496