Python "terminated unexpectedly" downloading Calibre 4

chinax · 10-04-2019, 01:36 AM

Just tried about three different times to install Calibre 4, 32- and 64-bit. Each time I get an error message that reads:

Python function terminated unexpectedly
No module named QtWebKitWidgets (Error Code: 1)

How can I fix this?

kovidgoyal · 10-04-2019, 02:12 AM

You are installing it on what? I am guessing linux, which would probably mean some system library is missing/outdated, you can set LD_DEBUG=libs to get debug output about it.

chinax · 10-06-2019, 10:38 PM

Installing on windows 10

kovidgoyal · 10-06-2019, 11:30 PM

You are getting this error when? there is no python involved in installing calibre on windows?

Katja_hbg · 10-07-2019, 01:21 AM

Hi,
I get exact the same error message.

I am using an old netbook with win7 and I am afraid it will not run with win10.
Anyhow, it is setup with calibre 64bit 3.39.1 for debugging (msi and tar) and still run well.

To test calibre 4 parallel, I download 32bit msi and install it (without adding tar file for debugging).
Installation is done into a different folder and all looks good.
When starting the icon, the error message appears.

So maybe a mess with my debugging setup?
Any detailed help is apprechiated as I am not a developer.

kovidgoyal · 10-07-2019, 01:26 AM

If you are on a an old win7 machine and calibre 4 does not run I suggest you stay with calibre 3. The best you can try is updating the graphics drivers, but if that does not work, calibre 4 is not going to run on it.

Katja_hbg · 10-13-2019, 04:00 AM

Found the root cause. For those with same error message, this may help you.

As mentioned I install on old win 7 netbook version 3-64bit and 4-32bit in different folder. Also the related tar files are stored, as I like to do some investigation.

As long as the environment variable CALIBRE_DEVELOP_FROM was not set, the icon start version 3 resp. 4 (only one could run). But when it was set to Calibre 3 src, start of calibre 4 show error message above. And the other way around.

Knowing that, this is not an issue anymore for me.

10-04-2019, 01:36 AM	#1
chinax Member Posts: 24 Karma: 90156 Join Date: Jul 2017 Device: Nook Glowlight, Sony DPT-CP1	Python "terminated unexpectedly" downloading Calibre 4 Just tried about three different times to install Calibre 4, 32- and 64-bit. Each time I get an error message that reads: Python function terminated unexpectedly No module named QtWebKitWidgets (Error Code: 1) How can I fix this?

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10-04-2019, 02:12 AM	#2
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	You are installing it on what? I am guessing linux, which would probably mean some system library is missing/outdated, you can set LD_DEBUG=libs to get debug output about it.

10-06-2019, 10:38 PM	#3
chinax Member Posts: 24 Karma: 90156 Join Date: Jul 2017 Device: Nook Glowlight, Sony DPT-CP1	Installing on windows 10

10-06-2019, 11:30 PM	#4
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	You are getting this error when? there is no python involved in installing calibre on windows?

10-07-2019, 01:21 AM	#5
Katja_hbg Groupie Posts: 183 Karma: 158116 Join Date: Oct 2015 Device: Kobo Glo HD (landscape), Kobo Aura One	Hi, I get exact the same error message. I am using an old netbook with win7 and I am afraid it will not run with win10. Anyhow, it is setup with calibre 64bit 3.39.1 for debugging (msi and tar) and still run well. To test calibre 4 parallel, I download 32bit msi and install it (without adding tar file for debugging). Installation is done into a different folder and all looks good. When starting the icon, the error message appears. So maybe a mess with my debugging setup? Any detailed help is apprechiated as I am not a developer.

10-07-2019, 01:26 AM	#6
kovidgoyal creator of calibre Posts: 45,345 Karma: 27182818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	If you are on a an old win7 machine and calibre 4 does not run I suggest you stay with calibre 3. The best you can try is updating the graphics drivers, but if that does not work, calibre 4 is not going to run on it.

10-13-2019, 04:00 AM	#7
Katja_hbg Groupie Posts: 183 Karma: 158116 Join Date: Oct 2015 Device: Kobo Glo HD (landscape), Kobo Aura One	Found the root cause. For those with same error message, this may help you. As mentioned I install on old win 7 netbook version 3-64bit and 4-32bit in different folder. Also the related tar files are stored, as I like to do some investigation. As long as the environment variable CALIBRE_DEVELOP_FROM was not set, the icon start version 3 resp. 4 (only one could run). But when it was set to Calibre 3 src, start of calibre 4 show error message above. And the other way around. Knowing that, this is not an issue anymore for me.

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