Fails to run: "QGtkStyle could not resolve GTK."

[Paul Huygen]

I installed Calibre 3.14.0 as described in https://calibre-ebook.com/download_linux on an XUbuntu 17.10 Desktop. When I try to run it, Calibre aborts with the message "QGtkStyle could not resolve GTK. Make sure you have installed the proper libraries."

Please can you help to sove this problem?
Cheers,

Paul Huygen

[Kovid Goyal (kovid)]

That error looks like it is coming from Qt trying to load the system
theme, which will only happen if you have set the environment variable
for it. Unset it and you will be fine. See
https://manual.calibre-ebook.com/customize.html#environment-variables

 status invalid

[Paul Huygen (paul-huygen)]

Dear Kovid.

On 12/27/2017 03:35 AM, Kovid Goyal wrote:
> That error looks like it is coming from Qt trying to load the system
> theme, which will only happen if you have set the environment variable
> for it. Unset it and you will be fine. See
> https://manual.calibre-ebook.com/customize.html#environment-variables
>
> status invalid
>
> ** Changed in: calibre
> Status: New => Invalid
>

Great, it works. I am very glad.

Cheers,

Paul

[Peter Kelly (waylanderpk)]

I'm using Ubutun 17.10 mate, I have the same issue. Changing the environment variable did not work.

peter@Talesian:/opt/calibre/bin$ CALIBRE_USE_SYSTEM_THEME=1 calibre
QGtkStyle could not resolve GTK. Make sure you have installed the proper libraries.

peter@Talesian:/opt/calibre/bin$ CALIBRE_USE_SYSTEM_THEME=0 calibre
QGtkStyle could not resolve GTK. Make sure you have installed the proper libraries.

[Kovid Goyal (kovid)]

That value of the environment variable is irrelevant, calibre checks for its existence.

[Mark Oliver (flvegat)]

CALIBRE_USE_SYSTEM_THEME=1 fixed the problem on my Ubuntu 18.04 LTS

[Paul Huygen (paul-huygen)]

On 08/10/2018 07:22 PM, Mark Oliver wrote:
> CALIBRE_USE_SYSTEM_THEME=1 fixed the problem on my Ubuntu 18.04 LTS
>
Thanks,

Paul Huygen

[Sean Lawrence (sklawren)]

It doesn't work for me, either. Same experience as Peter.