Weird errors when running Unity from the command line

I am trying to run Unity from the command line (under Jenkins) but I am getting the following weird errors; does anyone know how I can fix them?

My command line is -batchmode -nographics -buildLinux64Player build/main.linux64 -quit -username xxxx -password 'xxxx'

`CreateDirectory ‘/var/lib/jenkins/.cache/unity3d’ failed: (current dir: /var/lib/jenkins/workspace/Unity build)
DisplayProgressbar: Unity license
[0430/] Running without the SUID sandbox! See chromium - An open-source project to help move the web forward. - Monorail for more information on developing with the sandbox on.
[0430/] Check failed: process != -1. Failed to launch zygote process

Native stacktrace:

/opt/unity/Editor/Data/MonoEmbedRuntime/ [0x7f3b1c76cbe1]
/lib64/ [0x7f3b3218bc2f]
/lib64/ [0x7f3b29b046f5]`

This turned out to be not enough memory (512MB) in the cloud server. I gave it 1GB and the issue went away (I now have another error but I will raise another ticket for that).