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The problem comes from the fac that pillow is built without jpeg support, see the file SAGE_ROOT/build/pkgs/pillow/spkg-install : https://git.sagemath.org/sage.git/tree/build/pkgs/pillow/spkg-install

If you want to fix the issue, and if you built Sage from source, you can :

• install the (ubuntu) package libjpeg-dev
• remove the line --disable-jpeg \ line in SAGE_ROOT/build/pkgs/pillow/spkg-install
• recompile pillow with sage -f pillow

The problem comes from the fac fact that pillow is built without jpeg support, see the file SAGE_ROOT/build/pkgs/pillow/spkg-install : https://git.sagemath.org/sage.git/tree/build/pkgs/pillow/spkg-install

If you want to fix the issue, and if you built Sage from source, you can :

• install the (ubuntu) package libjpeg-dev
• remove the line --disable-jpeg \ line in SAGE_ROOT/build/pkgs/pillow/spkg-install
• recompile pillow with sage -f pillow

The problem comes from the fact that pillow is built without jpeg support, support (no idea why), see the file SAGE_ROOT/build/pkgs/pillow/spkg-install : https://git.sagemath.org/sage.git/tree/build/pkgs/pillow/spkg-install

If you want to fix the issue, and if you built Sage from source, you can :

• install the (ubuntu) package libjpeg-dev
• remove the line --disable-jpeg \ line in SAGE_ROOT/build/pkgs/pillow/spkg-install
• recompile pillow with sage -f pillow