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  .