blueman looking for /sbin/iptables

[Dominador A. Nobleza Jr.]

FAILED TO APPLY NETWORK SETTINGS
You might not be able to connect to the Bluetooth network via this machine

\/ Exception
g-dbus-error-quark: GDBus.Error:org.freedesktop.DBus.Error.Failed: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/blueman/main/DbusService.py", line 124, in _handle_method_call
    ok(method(*args))
  File "/usr/lib/python3/dist-packages/blueman/plugins/mechanism/Network.py", line 56, in _reload_network
    nc.apply_settings()
  File "/usr/lib/python3/dist-packages/blueman/main/NetConf.py", line 384, in apply_settings
    self.del_ipt_rules()
  File "/usr/lib/python3/dist-packages/blueman/main/NetConf.py", line 329, in del_ipt_rules
    call(["/sbin/iptables", "-t", table, "-D", chain] + rule.split(" "))
  File "/usr/lib/python3.8/subprocess.py", line 340, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.8/subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1702, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/sbin/iptables'
 (0)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.25
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Sat Oct 3 21:05:42 2020
InstallationDate: Installed on 2020-09-17 (16 days ago)
InstallationMedia: Ubuntu-MATE 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_PH:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_PH.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2020-10-01 (2 days ago)
VarLogDistupgradeTermlog:

[Launchpad Janitor (janitor)]

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

[Ken Sharp (kennybobs)]

On upgrade from Bionic to Focal, this now pops up at every desktop log in.

/sbin/iptables indeed does not exist. iptables has been moved to /usr/sbin/iptables for some reason. This has obviously been hardcoded into Blueman and really should have been spotted during testing.

$ sudo ln -s /usr/sbin/iptables /sbin/iptables
should be a workaround.

A lot of people have suggested
$ sudo apt-get install --reinstall iptables
but this makes no difference for me.