[Bug 1913330] [NEW] pull-debian-source fails with AttributeError: 'filter' object has no attribute 'append'

[Hans Joachim Desserud]

Public bug reported:

pull-debian-source on Ubuntu Hirsute fails when attempting to download a
package, for instance:

$ pull-debian-source ubuntu-dev-tools
Traceback (most recent call last):
  File "/usr/bin/pull-debian-source", line 11, in <module>
    PullPkg.main(distro='debian', pull='source')
  File "/usr/lib/python3/dist-packages/ubuntutools/pullpkg.py", line 103, in main
    cls(*args, **kwargs).pull()
  File "/usr/lib/python3/dist-packages/ubuntutools/pullpkg.py", line 405, in pull
    srcpkg = DISTRO_PKG_CLASS[distro](**params)
  File "/usr/lib/python3/dist-packages/ubuntutools/archive.py", line 578, in __init__
    self.masters.append(UDTConfig.defaults['DEBSEC_MIRROR'])
AttributeError: 'filter' object has no attribute 'append'

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubuntu-dev-tools 0.178
ProcVersionSignature: Ubuntu 5.8.0-36.40+21.04.1-generic 5.8.18
Uname: Linux 5.8.0-36-generic x86_64
ApportVersion: 2.20.11-0ubuntu55
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 26 19:13:18 2021
InstallationDate: Installed on 2020-11-05 (82 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Alpha amd64 (20201105)
PackageArchitecture: all
SourcePackage: ubuntu-dev-tools
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-dev-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug hirsute

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https://bugs.launchpad.net/bugs/1913330

Title:
  pull-debian-source fails with AttributeError: 'filter' object has no
  attribute 'append'

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