HI, I have error to install nodebb in debian:
16/1 22:29:48  - error: [build] client side styles build failed
You probably ran "npm audit" which threw out four less vulnerabilities and prompted you to update less to fix them, which broke the client side styles build step of NodeBB.
Fix it by downgrading less to the supported version by running "npm install firstname.lastname@example.org".
That should cause the next ./nodebb build to process correctly.