python3-mapnik not working due to stale icu65: refernces

[Hartmut Holzgraefe]

Even though libicu66 "(>= 66.1~rc-1~)" is listed as a dependency for python3-mapnik, there still seem to be some stale references to the previous libicu65 in the python bindings library:

This is simple to reproduce by just trying to import mapnik:

# python3 -c "import mapnik"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/mapnik/__init__.py", line 74, in <module>
    from ._mapnik import *
ImportError: /usr/lib/python3/dist-packages/mapnik/_mapnik.cpython-38-x86_64-linux-gnu.so: undefined symbol: _ZN6icu_6513UnicodeStringC1ERKS0_

The undefined symbol unmangled by c++filt is:

icu_65::UnicodeString::UnicodeString(icu_65::UnicodeString const&)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: python3-mapnik 1:0.0~20180723-588fc9062-3ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sun Apr 19 15:57:17 2020
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: python-mapnik
UpgradeStatus: No upgrade log present (probably fresh install)

[Trent Lloyd (lathiat)]

A no-change rebuild seems to correct this

[Launchpad Janitor (janitor)]

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

[Trent Lloyd (lathiat)]

= Test Case =

Simple test case per upstream docs:

python3 -c "import mapnik;print(mapnik.__file__)" # should return the path to the python bindings and no errors

Fails with the current package (1:0.0~20180723-588fc9062-3ubuntu2) - works with a no-change rebuilt package

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "lp1873670_mapnik_icu66.debdiff" seems to be a debdiff. The ubuntu-sponsors team has been subscribed to the bug report so that they can review and hopefully sponsor the debdiff. If the attachment isn't a patch, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issue please contact him.]

[Launchpad Janitor (janitor)]

This bug was fixed in the package python-mapnik - 1:0.0~20180723-588fc9062-3ubuntu3

---------------
python-mapnik (1:0.0~20180723-588fc9062-3ubuntu3) focal; urgency=medium

  * No-change rebuild for icu ABI compatibility (LP: #1873670)

 -- Trent Lloyd <email address hidden> Mon, 20 Apr 2020 10:48:03 +0800