Missing latex classes are causing bugs

Hi, I am Ubuntu and got LyX from its repository, but it seems that the examples in /usr/share/lyx/examples, like aa_sample.lyx are using non-default LaTeX classes. Causing a message bug like Textclass error The document uses a missing TeX class aa. LyX will not be able to produce

Missing latex classes are causing bugs

Hi, I am Ubuntu and got LyX from its repository, but it seems that the examples in /usr/share/lyx/examples, like aa_sample.lyx are using non-default LaTeX classes. Causing a message bug like Textclass error The document uses a missing TeX class aa. LyX will not be able to produce

Missing latex classes are causing bugs

Hi, I am Ubuntu and got LyX from its repository, but it seems that the examples in /usr/share/lyx/examples, like aa_sample.lyx are using non-default LaTeX classes. Causing a message bug like Textclass error The document uses a missing TeX class "aa". LyX will not be able to produce