New implementation of \MakeUppercase breaks Greek support in 8-bit TeX. · Issue #987 · latex3/latex2e · GitHub
conflict with documentclass boek and \part, because of MakeUppercase · Issue #58 · ho-tex/oberdiek · GitHub
![pdftex - error with \MakeUppercase (arg 1) after update to ubuntu 23.10 - TeX - LaTeX Stack Exchange pdftex - error with \MakeUppercase (arg 1) after update to ubuntu 23.10 - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/BYqOD.png)
pdftex - error with \MakeUppercase (arg 1) after update to ubuntu 23.10 - TeX - LaTeX Stack Exchange
![uppercase - \MakeUppercase does not uniformly capitalize in subsection titles - TeX - LaTeX Stack Exchange uppercase - \MakeUppercase does not uniformly capitalize in subsection titles - TeX - LaTeX Stack Exchange](https://i.stack.imgur.com/xsHDx.png)