lyx remove in Debian bullseye

[Wolfgang Engelmann]

I have several lyx 2.4.0 dev installed (which I named lyx; lyx240; 
lyx24n; lyx24x). They should be removed, before I install a lyx 2.3.6.1 
for debian.

sudo apt-get remove lyx
> Paket lyx240 not found (kann nicht gefunden werden)
How to remove these lyx's?
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