Is WSL required on linux?

[javP]

I just installed Calibre (7.12.0) on Kubuntu 24.04 according to the instructions on the page https://calibre-ebook.com/download_linux. In general it works fine, but when trying to open the book folder it does nothing. I see that it tries to open something called wslview. If I run it in the terminal I get an error message saying "WSL Interopability is disabled. Please enable it before using WSL."

I clarify that I do not have Windows with WSL. I only have Kubuntu. I also tried with the Calibre version available in the Ubuntu repositories, but the same thing happens.

Will anyone know how I can correct this?

Thanks.

[kovidgoyal]

If you are using wayland, switch back to x11 and you will likely be fine. You can also try setting the CALIBRE_NO_NATIVE_FILEDIALOGS environment variable to prevent calibre using the system file dialogs as descibed here: https://manual.calibre-ebook.com/cus...ment-variables

[javP]

Hello kovidgoyal, thanks for your answer. I am using X11 already. I tried the environment variable, but it doesn't worked:

javP@laptop:~$ env CALIBRE_NO_NATIVE_FILEDIALOGS=1 calibre
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
grep: /proc/sys/fs/binfmt_misc/WSLInterop: No such file or directory
WSL Interopability is disabled. Please enable it before using WSL.
grep: /proc/sys/fs/binfmt_misc/WSLInterop: No such file or directory
[error] WSL Interoperability is disabled. Please enable it before using WSL.
/usr/bin/wslview: line 216: /mnt/c/Windows/System32/reg.exe: No such file or directory
/usr/bin/wslview: line 308: [: -ge: unary operator expected
[error] This protocol is not supported before version 1903.

[javP]

I also noticed that it has the same problem if I try to open a pdf file. I have no problem with epub files.

[DiapDealer]

sudo apt purge wslu

Some packages (gimp-help-en) problematically require it as a dependency.

If you need gimp-help-en, then you may need to install a small text-based browser to satisfy the xdg www-browser requirement (that gimp-help needs) that the snap Firefox doesn't seem to. Hence why wslview gets installed to fulfill the www-browser need. Problems abound on this one.

[javP]

Hello DiapDealer. You're right, that was the problem. Thank you so much!!!