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Thank you! I installed Pagella and modified your command to
\renewcommand*{\chapnumfont}{\bfseries\fontPalatino\fontsize{100}{130}\selectfont\color{chaptergrey}}
To get the font to be bold and the right size. I didn't find a way to specify the shape to be upright like in the quotchap command, but ...

I ended up replacing `\f@encoding` with `T1` in the local copy of `quotchap.sty`. It's pretty ugly but finally Palatino (the one that came with TeX Live) is detected, I couldn't find an Unicode version of the font with its family code (or a way to assign code `ppl` to the font) so I don't see how ...

Thank you for the tips, I applied your suggested fixes. I'm a complete LaTeX noob (that's why I'm using a template) so I couldn't notice them. Yeah, I probably should have asked the maintainer in the first place.
Regarding the license, the code used to build the template is licensed under the AGPL ...

With XeLaTeX (in opposite to LuaLaTeX) I often have problems, if fonts are not correctly installed system-wide. LuaLaTeX can use fonts in the TEXMF tree without system wide installation. XeLaTeX can't.
I installed some other fonts to use specifically with this template and they're in the same ...

I'm compiling this template on Arch Linux with texlive-most installed.
As you can see from the log I'm getting the warning

LaTeX Font Warning: Font shape `TU/ppl/b/n' undefined
(Font) using `TU/lmr/m/n' instead on input line 13.

This is because in Dissertate.cls, the following line is present ...