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The solution I found was to re install version 2.3.0-1 (lyx - 2.3.0-1~artful~ppa1 in [this link][1]). For that, I manually downloaded the packages [fonts-lyx_2.3.0-1~artful~ppa1_all.deb][2], [lyx-common_2.3.0-1~artful~ppa1_all.deb][3] and [lyx_2.3.0-1~artful~ppa1_amd64.deb][4] from [here][5] (which ...

Yesterday I installed a lot of updates recommended by the software update app in Xubuntu 18.04. Today Lyx is not working properly. I have found (up to now) two problems:

1) Problem with the super index behavior. I cannot enter into "superscript mode" using keyboard anymore (I mean, pressing AltGR ...