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[Wolf Rogner <war@xxxxxx>]

What did I do:

I redirected python3 to python3.5 (ln -s)

I ran hplip-3.15.11.run which analyses and compiles the libraries according to the underlying system.
It worked fine.

printing works.

The log messages suggest that the compilation uses python 2.6 (I have
2.7 as default, which indicates that the installation routines
deliberately choose 2.6).

What I observed is that graphical frontends of 3.15.11 differ from the
utilities in 3.7.x (which is installed by default in 15.10).

Thus I tried to figure out if the issue can be reverted to just
requiring a fresh install of 3.7.x with python3.5 as default python3
installation.

I have no way of deinstalling the utilities (there is no uninstall
switch in the installation or at least I didn't find it).

So I can only install and confirm: It works.

I cannot tell or research the reason and if it is possible to fix the issue by simply reinstalling hplip from the standard repo.
>From a production point of view, I cannot install a library which is not supported through the standard repo.

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https://bugs.launchpad.net/bugs/1530656

Title:
  printing will fail with python3.5 set as default

Status in HPLIP:
  New
Status in hplip package in Ubuntu:
  New

Bug description:
  Setting Python 3.5 as the default for python3 breaks printing over
  HPlib.

  Steps to reproduce:

  sudo -s
  cd /usr/bin
  rm python3
  ln -s python3.5 python3

  ...

  print something using a hplip enabled printer -> printer stopped

  rm python3
  ln -s python3.4 python3 # this was the default setting after installation

  ...

  printing resumes

  I also observed a crash in the HPLip libraries which indicated the
  cause being in the hplip package. (this was not reproducable though)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: hplip 3.15.7-0ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jan  3 15:30:56 2016
  InstallationDate: Installed on 2013-05-17 (960 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64+mac (20130424)
  Lpstat: device for HP-Color-LaserJet-CP2025dn: hp:/net/HP_Color_LaserJet_CP2025dn?ip=10.1.0.20
  MachineType: Apple Inc. MacBookPro10,1
  Papersize: a4
  PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/HP-Color-LaserJet-CP2025dn.ppd'] failed with exit code 2: grep: /etc/cups/ppd/HP-Color-LaserJet-CP2025dn.ppd: Permission denied
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=UUID=3679e976-6405-4981-aa99-8c79d15e6aa3 ro quiet splash vt.handoff=7
  SourcePackage: hplip
  UpgradeStatus: Upgraded to wily on 2015-10-23 (72 days ago)
  dmi.bios.date: 12/21/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP101.88Z.00EE.B03.1212211437
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-C3EC7CD22292981F
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-C3EC7CD22292981F
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B03.1212211437:bd12/21/2012:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F:
  dmi.product.name: MacBookPro10,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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