[Bug 1946481] [NEW] NetworkManager cannot connect to ModemManager with "org.freedesktop.DBus.Error.AccessDenied"

[Pirouette Cacahuète]

Public bug reported:

Upgraded my laptop (ThinkPad P14s Gen2) from 21.04 to 21.10, trying to get access to Modem Manager fails with:
> error: couldn't create manager: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied

This was working on 21.04.

STR:
 - Open Settings, go to "Network"
OR
 - mmcli -m 0

Running mmcli as root workaround the problem, but I'm not able to use
network applet to connect my modem.

> $ id
uid=1000(alex) gid=1000(alex) groupes=1000(alex),4(adm),6(disk),20(dialout),24(cdrom),27(sudo),30(dip),44(video),46(plugdev),107(lpadmin),124(sambashare),137(libvirtd),155(docker)

** Affects: dbus (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1946481

Title:
  NetworkManager cannot connect to ModemManager with
  "org.freedesktop.DBus.Error.AccessDenied"

Status in dbus package in Ubuntu:
  New

Bug description:
  Upgraded my laptop (ThinkPad P14s Gen2) from 21.04 to 21.10, trying to get access to Modem Manager fails with:
  > error: couldn't create manager: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied

  This was working on 21.04.

  STR:
   - Open Settings, go to "Network"
  OR
   - mmcli -m 0

  Running mmcli as root workaround the problem, but I'm not able to use
  network applet to connect my modem.

  > $ id
  uid=1000(alex) gid=1000(alex) groupes=1000(alex),4(adm),6(disk),20(dialout),24(cdrom),27(sudo),30(dip),44(video),46(plugdev),107(lpadmin),124(sambashare),137(libvirtd),155(docker)

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