我正在使用 debian 测试，并且时不时地进行更新....在上周进行一次更新之后，我无法呈现我正在处理的 lyx 文档。
lyx 上的错误显示：
! Undefined control sequence.
l.115 \xdef\@fontenc@load@list{\@fontenc@load@list
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
我该怎么做才能解决这个问题？我正在使用 lyx 2.3.4.2-2 和 texlive-latex-base 2019.20200218-1。