[Bug 1795989] Re: Ubuntu18.04 LTS: python3-ldap package depends on python2

[Andreas Hasenack]

Thanks for this bug report.

Confirmed on bionic, and fixed in cosmic which has 3.1.0-2.

Debian commit: https://salsa.debian.org/python-team/modules/python-
ldap/commit/6685e867b51b766abb37e527c0ec4dc99fcd4cfd

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Title:
  Ubuntu18.04 LTS: python3-ldap package depends on python2

Status in python-ldap package in Ubuntu:
  New

Bug description:
  If one attempts to install the python3-ldap package, a number of
  python2 related dependencies are also pulled in for installation:

  # apt install python3-ldap
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  The following additional packages will be installed:
    libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap python-minimal python-pyasn1 python-pyasn1-modules python2.7 python2.7-minimal
  Suggested packages:
    python-doc python-tk python2.7-doc binfmt-support
  The following NEW packages will be installed:
    libpython-stdlib libpython2.7-minimal libpython2.7-stdlib python python-ldap python-minimal python-pyasn1 python-pyasn1-modules python2.7 python2.7-minimal python3-ldap
  0 upgraded, 11 newly installed, 0 to remove and 0 not upgraded.
  Need to get 4,202 kB of archives.
  After this operation, 18.3 MB of additional disk space will be used.
  Do you want to continue? [Y/n] n
  Abort.

  
  Looking at the dependencies for the package, we see:

  Depends: python3 (<< 3.7), python3 (>= 3.6~), python3-pyasn1 (>=
  0.3.7), python3-pyasn1-modules, python3:any (>= 3.3.2-2~), python-ldap
  (= 3.0.0-1), libc6 (>= 2.14), libldap-2.4-2 (>= 2.4.11)

  
  So python2 is being pulled in because of the dependency on "python-ldap"

  It looks like this issue may be fixed in the 3.1.0-1 package via this
  change:

  3.1.0-1
  * debian/python-ldap.docs
   - rename to docs (avoid dependency other python variant)

  It would be nice if this could be fixed for Ubuntu18.04 LTS users.

  Thanks!

  # lsb_release -rd
  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04

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