MobileRead Forums - View Single Post - Fresh install "No suitable graphics backend found" error message

willbontrager · 08-29-2022, 06:16 PM

I have installed Calibre as an "isolated" install so it does not require root access.

For testing, I'm using a CLI (SSH). The PDF never gets made. An error message is "No suitable graphics backend found" (search didn't find an instance of that phrase on the forum).

What can I do to get past this point? Thank you!

Here is a copy of a session:

[ds1363]$ /home/willbont/bontragercgi.com/calibre/calibre/ebook-convert /home/willbont/bontragercgi.com/CalibreTest/22/page.html /home/willbont/bontragercgi.com/CalibreTest/22/index.pdf
1% Converting input to HTML...
qt.webenginecontext:

GL Type: disabled
Surface Type: DefaultRenderableType
Surface Profile: NoProfile
Surface Version: 2.0
QSG RHI Backend: OpenGL
Using Supported QSG Backend: yes
Using Software Dynamic GL: no
Using Multithreaded OpenGL: no

Init Parameters:
* application-name ebook-convert
* browser-subprocess-path /home/willbont/bontragercgi.com/calibre/calibre/libexec/QtWebEngineProcess
* disable-features ConsolidatedMovementXY,InstalledApp,BackgroundFetc h,WebOTP,WebPayments,WebUSB,PictureInPicture
* disable-gpu
* disable-setuid-sandbox
* disable-speech-api
* enable-features NetworkServiceInProcess,TracingServiceInProcess
* enable-threaded-compositing
* in-process-gpu
* use-gl disabled

InputFormatPlugin: HTML Input running
on /home/willbont/bontragercgi.com/CalibreTest/22/page.html
Language not specified
Creator not specified
Building file list...
IgnoreFile("Could not read from file: / with error: [Errno 21] Is a directory: '/'")
Normalizing filename cases
Rewriting HTML links
/ is a link to a directory. Ignoring.
34% Running transforms on e-book...
Merging user specified metadata...
Detecting structure...
Auto generated TOC with 2 entries.
Flattening CSS and remapping font sizes...
Stylesheet 'https://lightfocus.com/17includes/17lightfocus.css?recache' referenced by file 'page.html' not in manifest
Source base font size is 12.00000pt
Removing fake margins...
Cleaning up manifest...
Trimming unused files from manifest...
Creating PDF Output...
67% Running PDF Output plugin
68% Parsed all content for markup transformation
70% Completed markup transformation
No suitable graphics backend found

Load of clbr://internal.invalid/book/page.html failed
[ds1363]$

08-29-2022, 06:16 PM	#1
willbontrager Junior Member Posts: 6 Karma: 10 Join Date: Jun 2018 Device: Various	Fresh install "No suitable graphics backend found" error message I have installed Calibre as an "isolated" install so it does not require root access. For testing, I'm using a CLI (SSH). The PDF never gets made. An error message is "No suitable graphics backend found" (search didn't find an instance of that phrase on the forum). What can I do to get past this point? Thank you! Here is a copy of a session: [ds1363]$ /home/willbont/bontragercgi.com/calibre/calibre/ebook-convert /home/willbont/bontragercgi.com/CalibreTest/22/page.html /home/willbont/bontragercgi.com/CalibreTest/22/index.pdf 1% Converting input to HTML... qt.webenginecontext: GL Type: disabled Surface Type: DefaultRenderableType Surface Profile: NoProfile Surface Version: 2.0 QSG RHI Backend: OpenGL Using Supported QSG Backend: yes Using Software Dynamic GL: no Using Multithreaded OpenGL: no Init Parameters: * application-name ebook-convert * browser-subprocess-path /home/willbont/bontragercgi.com/calibre/calibre/libexec/QtWebEngineProcess * disable-features ConsolidatedMovementXY,InstalledApp,BackgroundFetc h,WebOTP,WebPayments,WebUSB,PictureInPicture * disable-gpu * disable-setuid-sandbox * disable-speech-api * enable-features NetworkServiceInProcess,TracingServiceInProcess * enable-threaded-compositing * in-process-gpu * use-gl disabled InputFormatPlugin: HTML Input running on /home/willbont/bontragercgi.com/CalibreTest/22/page.html Language not specified Creator not specified Building file list... IgnoreFile("Could not read from file: / with error: [Errno 21] Is a directory: '/'") Normalizing filename cases Rewriting HTML links / is a link to a directory. Ignoring. 34% Running transforms on e-book... Merging user specified metadata... Detecting structure... Auto generated TOC with 2 entries. Flattening CSS and remapping font sizes... Stylesheet 'https://lightfocus.com/17includes/17lightfocus.css?recache' referenced by file 'page.html' not in manifest Source base font size is 12.00000pt Removing fake margins... Cleaning up manifest... Trimming unused files from manifest... Creating PDF Output... 67% Running PDF Output plugin 68% Parsed all content for markup transformation 70% Completed markup transformation No suitable graphics backend found Load of clbr://internal.invalid/book/page.html failed [ds1363]$