I am now on ubuntu 12.04 LTS with hplib from the ubuntu repository. Same problem.

I put the output of "hp-check -t"  as attachment.

Here's the output of hp-align -g:

kmarien@Evo-D310:~$ hp-align -g

HP Linux Imaging and Printing System (ver. 3.12.2)
Printer Cartridge Alignment Utility ver. 5.0

Copyright (c) 2001-9 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

hp-align[5053]: debug: getDeviceUri(None, None, ('hp',), {'align-type': (<built-in function ne>, 0)}, , True)
hp-align[5053]: debug: Mode=1
hp-align[5053]: debug: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO: back_end:hp is_hp:True bus:usb model:DeskJet_940C serial:HU24H1P2BJCO dev_file: host: zc: port:1
hp-align[5053]: debug: Cache miss: deskjet_940c
hp-align[5053]: debug: Reading file: /usr/share/hplip/data/models/models.dat
hp-align[5053]: debug: Searching for section [deskjet_940c] in file /usr/share/hplip/data/models/models.dat
hp-align[5053]: debug: Found section [deskjet_940c] in file /usr/share/hplip/data/models/models.dat
hp-align[5053]: debug: {'hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO': ['HP_DeskJet_940C']}
Using device: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO

hp-align[5053]: debug: Loading user settings...
hp-align[5053]: debug: FAB command: /usr/bin/hp-fab 
hp-align[5053]: debug: Scan command: /usr/bin/simple-scan %SANE_URI%
hp-align[5053]: debug: Auto refresh: False
hp-align[5053]: debug: Auto refresh rate: 30
hp-align[5053]: debug: Auto refresh type: 1
hp-align[5053]: debug: Systray visible: 0
hp-align[5053]: debug: Systray messages: 0
hp-align[5053]: debug: Last used device URI: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO
hp-align[5053]: debug: Last used printer: 
hp-align[5053]: debug: Working directory: .
hp-align[5053]: debug: Starting GUI loop...
hp-align[5053]: debug: showStartPage()
hp-align[5053]: debug: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO: back_end:hp is_hp:True bus:usb model:DeskJet_940C serial:HU24H1P2BJCO dev_file: host: zc: port:1
hp-align[5053]: debug: endStartPage()
hp-align[5053]: debug: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO: back_end:hp is_hp:True bus:usb model:DeskJet_940C serial:HU24H1P2BJCO dev_file: host: zc: port:1
hp-align[5053]: debug: align-type=3
hp-align[5053]: debug: Device URI: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO
hp-align[5053]: debug: Printer: None
hp-align[5053]: debug: Connecting to com.hplip.StatusService (try #1)...
hp-align[5053]: debug: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO: back_end:hp is_hp:True bus:usb model:DeskJet_940C serial:HU24H1P2BJCO dev_file: host: zc: port:1
hp-align[5053]: debug: URI: backend=hp, is_hp=True, bus=usb, model=DeskJet_940C, serial=HU24H1P2BJCO, dev=, host=, port=1
hp-align[5053]: debug: Model/UI model: DeskJet_940C/HP Deskjet 940c
hp-align[5053]: debug: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO: back_end:hp is_hp:True bus:usb model:DeskJet_940C serial:HU24H1P2BJCO dev_file: host: zc: port:1
hp-align[5053]: debug: Re-reading CUPS printer queue information.
hp-align[5053]: debug: showLoadPaperPage()
hp-align[5053]: debug: showAlignmentNumberPage('A','h','kc',2,11)
hp-align[5053]: debug: endAlignmentNumberPage('A')
hp-align[5053]: debug: A=1
hp-align[5053]: debug: showAlignmentNumberPage('B','v','kc',2,11)
hp-align[5053]: debug: endAlignmentNumberPage('B')
hp-align[5053]: debug: B=1
hp-align[5053]: debug: showAlignmentNumberPage('C','v','k',2,11)
hp-align[5053]: debug: endAlignmentNumberPage('C')
hp-align[5053]: debug: C=1
hp-align[5053]: debug: setAlignButton(0)
hp-align[5053]: debug: showAlignmentNumberPage('D','v','kc',2,11)
hp-align[5053]: debug: endAlignmentNumberPage('D')
hp-align[5053]: debug: D=1
hp-align[5053]: debug: alignType3Phase2(<base.device.Device object at 0xa5e7e8c>,1,1,1,1)
hp-align[5053]: debug: 0000:  1b 45 1b 25 2d 31 32 33 34 35 58 40 50 4a 4c 20  .E.%-12345X@PJL 
hp-align[5053]: debug: 0010:  4a 4f 42 20 4e 41 4d 45 3d 22 75 6e 6e 61 6d 65  JOB NAME="unname
hp-align[5053]: debug: 0020:  64 22 0a 40 50 4a 4c 20 45 4e 54 45 52 20 4c 41  d".@PJL ENTER LA
hp-align[5053]: debug: 0030:  4e 47 55 41 47 45 3d 50 43 4c 33 47 55 49 0a 1b  NGUAGE=PCL3GUI..
hp-align[5053]: debug: 0040:  45 1b 26 62 31 38 57 50 4d 4c 20 04 00 07 01 04  E.&b18WPML .....
hp-align[5053]: debug: 0050:  01 05 03 02 05 08 02 ff c4 1b 45 40 50 4a 4c 20  ..........E@PJL 
hp-align[5053]: debug: 0060:  45 4f 4a 0a 1b 45 1b 25 2d 31 32 33 34 35 58     EOJ..E.%-12345X
hp-align[5053]: debug: Opening device: hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO (for printing)
hp-align[5053]: debug: I/O mode=1
hp-align[5053]: debug: device-id=1
hp-align[5053]: debug: Opened device: hp (backend=hp:/usb/DeskJet_940C?serial=HU24H1P2BJCO, is_hp=True, bus=usb, model=DeskJet_940C, dev=, serial=HU24H1P2BJCO, host=, port=1)
hp-align[5053]: debug: Opening PRINT channel...
hp-align[5053]: debug: channel-id=2
hp-align[5053]: debug: Writing 111 bytes to channel 2 (device-id=1)...
hp-align[5053]: debug: Result code=0
hp-align[5053]: debug: 0000:  1b 45 1b 25 2d 31 32 33 34 35 58 40 50 4a 4c 20  .E.%-12345X@PJL 
hp-align[5053]: debug: 0010:  4a 4f 42 20 4e 41 4d 45 3d 22 75 6e 6e 61 6d 65  JOB NAME="unname
hp-align[5053]: debug: 0020:  64 22 0a 40 50 4a 4c 20 45 4e 54 45 52 20 4c 41  d".@PJL ENTER LA
hp-align[5053]: debug: 0030:  4e 47 55 41 47 45 3d 50 43 4c 33 47 55 49 0a 1b  NGUAGE=PCL3GUI..
hp-align[5053]: debug: 0040:  45 1b 26 62 31 37 57 50 4d 4c 20 04 00 07 01 04  E.&b17WPML .....
hp-align[5053]: debug: 0050:  01 05 03 02 06 08 01 3c 1b 45 40 50 4a 4c 20 45  .......<.E@PJL E
hp-align[5053]: debug: 0060:  4f 4a 0a 1b 45 1b 25 2d 31 32 33 34 35 58        OJ..E.%-12345X
hp-align[5053]: debug: Writing 110 bytes to channel 2 (device-id=1)...
hp-align[5053]: debug: Result code=0
hp-align[5053]: debug: 0000:  1b 45 1b 25 2d 31 32 33 34 35 58 40 50 4a 4c 20  .E.%-12345X@PJL 
hp-align[5053]: debug: 0010:  4a 4f 42 20 4e 41 4d 45 3d 22 75 6e 6e 61 6d 65  JOB NAME="unname
hp-align[5053]: debug: 0020:  64 22 0a 40 50 4a 4c 20 45 4e 54 45 52 20 4c 41  d".@PJL ENTER LA
hp-align[5053]: debug: 0030:  4e 47 55 41 47 45 3d 50 43 4c 33 47 55 49 0a 1b  NGUAGE=PCL3GUI..
hp-align[5053]: debug: 0040:  45 1b 26 62 31 37 57 50 4d 4c 20 04 00 07 01 04  E.&b17WPML .....
hp-align[5053]: debug: 0050:  01 05 03 01 07 08 01 3c 1b 45 40 50 4a 4c 20 45  .......<.E@PJL E
hp-align[5053]: debug: 0060:  4f 4a 0a 1b 45 1b 25 2d 31 32 33 34 35 58        OJ..E.%-12345X
hp-align[5053]: debug: Writing 110 bytes to channel 2 (device-id=1)...
hp-align[5053]: debug: Result code=0
hp-align[5053]: debug: 0000:  1b 45 1b 25 2d 31 32 33 34 35 58 40 50 4a 4c 20  .E.%-12345X@PJL 
hp-align[5053]: debug: 0010:  4a 4f 42 20 4e 41 4d 45 3d 22 75 6e 6e 61 6d 65  JOB NAME="unname
hp-align[5053]: debug: 0020:  64 22 0a 40 50 4a 4c 20 45 4e 54 45 52 20 4c 41  d".@PJL ENTER LA
hp-align[5053]: debug: 0030:  4e 47 55 41 47 45 3d 50 43 4c 33 47 55 49 0a 1b  NGUAGE=PCL3GUI..
hp-align[5053]: debug: 0040:  45 1b 26 62 31 37 57 50 4d 4c 20 04 00 07 01 04  E.&b17WPML .....
hp-align[5053]: debug: 0050:  01 05 03 02 07 08 01 1e 1b 45 40 50 4a 4c 20 45  .........E@PJL E
hp-align[5053]: debug: 0060:  4f 4a 0a 1b 45 1b 25 2d 31 32 33 34 35 58        OJ..E.%-12345X
hp-align[5053]: debug: Writing 110 bytes to channel 2 (device-id=1)...
hp-align[5053]: debug: Result code=0
hp-align[5053]: debug: Closing PRINT channel...
hp-align[5053]: debug: alignType3Phase3(<base.device.Device object at 0xa5e7e8c>)
hp-align[5053]: debug: Printing file '/usr/share/hplip/data/pcl/align3_9xx.pcl.gz' to queue 'HP_DeskJet_940C' (gzip=True, direct=False, raw=True, remove=False)
hp-align[5053]: debug: gunzip -c /usr/share/hplip/data/pcl/align3_9xx.pcl.gz | lpr -o raw  -PHP_DeskJet_940C
hp-align[5053]: debug: showPageEdgePage()
hp-align[5053]: debug: endPageEdgePage()
Traceback (most recent call last):
  File "/usr/share/hplip/ui4/aligndialog.py", line 428, in NextButton_clicked
    self.nextSequence()
  File "/usr/share/hplip/ui4/aligndialog.py", line 458, in nextSequence
    seq(*t)
  File "/usr/share/hplip/ui4/aligndialog.py", line 584, in endPageEdgePage
    v = int(str(self.PageEdgeComboBox.currentText())[1:])
ValueError: invalid literal for int() with base 10: ''


I did cancel at the align command.


Regards,
Kris Marien