thank you! running mtxrun --generate did the trick.
NB: the other commands suggested produced the same errors, but it doesn't
matter anymore.
Thank You Wolfgang for your quick response

Le dim. 2 août 2020 à 10:13, Wolfgang Schuster <
wolfgang.schuster.lists@gmail.com> a écrit :

> kaddour kardio schrieb am 02.08.2020 um 11:02:
> >   Hi, i am running the latest luametatex 2.07.2 from [aur] repos in my
> > archlinux machine, i got this error when trying to update my font lists
> >
> >                   (lmtx) ➜  ~ mtxrun --script fonts --reload
> >                   mtxrun          | unknown script 'fonts.lua' or
> > 'mtx-fonts.lua'
>
> The same question was asked a few days ago:
>
> https://www.mail-archive.com/ntg-context@ntg.nl/msg95227.html
>
> The solution was to refresh the database: luatools --generate
>
> Aside from luatools you can also use mtxrun to refresh the database
> (mtxrun --generate) which also works when you clear it (mtxrun --script
> cache --erase) where luatools fails.
>
> > is it a feature? thanks
>
> No.
>
> Wolfgang
>
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-- 
Dr YAHYAOUI Mohamed Kaddour, cardiologue  .