What does "No internet connection" really mean?

[Doobie Brother]

calibre 7.16
Python 3.12.4
Linux

I have been unable to download news for a few weeks since some version. It just says "No internet connection" once, any further attempts to download news yield nothing.

Other internetty things in Calibre work fine, such as "Wiki Reader" and "Get books". There don't seem to be any settings for networking. In Miscellaneous it says "No proxies used".

Tried starting in debug mode, nothing is logged about networking.

I have run out of ideas.

ApplicationPaletteChange event ignored
Using calibre Qt style: True
calibre Debug log
calibre 7.16  embedded-python: False
Linux-6.9.10-amd64-x86_64-with-glibc2.39 Linux ('64bit', 'ELF')
('Linux', '6.9.10-amd64', '#1 SMP PREEMPT_DYNAMIC Debian 6.9.10-1 (2024-07-19)')
Python 3.12.4
Interface language: None
EXE path: /usr/bin/python3.12
Successfully initialized third party plugins: Wiki Reader (2, 2, 1)
calibre 7.16  embedded-python: False
Linux-6.9.10-amd64-x86_64-with-glibc2.39 Linux ('64bit', 'ELF')
('Linux', '6.9.10-amd64', '#1 SMP PREEMPT_DYNAMIC Debian 6.9.10-1 (2024-07-19)')
Python 3.12.4
Interface language: None
EXE path: /usr/bin/python3.12
Successfully initialized third party plugins: Wiki Reader (2, 2, 1)
QPA platform: xcb
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 139.93687230989957 x 139.9591836734694
[0.00] Starting up...
[0.01] Showing splash screen...
[1.08] splash screen shown
[1.08] Initializing db...
[1.16] db initialized
[1.16] Constructing main UI...
[1.69] GUI main window shown
[1.77] main UI initialized...
[1.77] Hiding splash screen
[1.77] splash screen hidden
[1.77] Started up in 1.77 seconds with 7 books

[gbm]

Here is your problem:

calibre 7.16  embedded-python: False

Uninstall the Debian disto version of calibre and go to calibre Download for Linux download official calibre.

bernie

Originally Posted by Doobie Brother

calibre 7.16
Python 3.12.4
Linux

I have been unable to download news for a few weeks since some version. It just says "No internet connection" once, any further attempts to download news yield nothing.

Other internetty things in Calibre work fine, such as "Wiki Reader" and "Get books". There don't seem to be any settings for networking. In Miscellaneous it says "No proxies used".

Tried starting in debug mode, nothing is logged about networking.

I have run out of ideas.

ApplicationPaletteChange event ignored
Using calibre Qt style: True
calibre Debug log
calibre 7.16  embedded-python: False
Linux-6.9.10-amd64-x86_64-with-glibc2.39 Linux ('64bit', 'ELF')
('Linux', '6.9.10-amd64', '#1 SMP PREEMPT_DYNAMIC Debian 6.9.10-1 (2024-07-19)')
Python 3.12.4
Interface language: None
EXE path: /usr/bin/python3.12
Successfully initialized third party plugins: Wiki Reader (2, 2, 1)
calibre 7.16  embedded-python: False
Linux-6.9.10-amd64-x86_64-with-glibc2.39 Linux ('64bit', 'ELF')
('Linux', '6.9.10-amd64', '#1 SMP PREEMPT_DYNAMIC Debian 6.9.10-1 (2024-07-19)')
Python 3.12.4
Interface language: None
EXE path: /usr/bin/python3.12
Successfully initialized third party plugins: Wiki Reader (2, 2, 1)
QPA platform: xcb
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 139.93687230989957 x 139.9591836734694
[0.00] Starting up...
[0.01] Showing splash screen...
[1.08] splash screen shown
[1.08] Initializing db...
[1.16] db initialized
[1.16] Constructing main UI...
[1.69] GUI main window shown
[1.77] main UI initialized...
[1.77] Hiding splash screen
[1.77] splash screen hidden
[1.77] Started up in 1.77 seconds with 7 books

[kovidgoyal]

No internet connection will happen when you have network manager installed and it reports that internet is unavailable. Either fix that or go to Preferences->Tweaks and set skip_network_check = True

[Doobie Brother]

Originally Posted by kovidgoyal

skip_network_check = True

Not using Network Manager so I uninstalled it, but it's made no difference [haven't bothered rebooting yet though]. The tweak above has fixed it.

What is the point of asking network manager? If networking is working, then fetching news will work. If it isn't working, then fetching news won't work. "Get books" seems to work without this feature.
Having said that, my computers are permanently connected to the internet, so maybe there is some aspect that goes wrong with temporary internet connections.