5x 1080 TI on linux

[fl0at0xff]

Hello.

I bought 5 Nvidia 1080 TI Turbo with 11 GB of RAM. 
I have some problem to make it work Ubuntu 20.04.4 LTS

I followed this guide (https://www.unix-ninja.com/p/Building_a_...-_Part_III), the installation of NVIDIA driver seems good but when I start hashcat, I always have this error : 

Code:

No devices found/left.

When I run lspci, I correctly see my 1080 TI. 

thank you for your precious help