Sorry if this is answered elsewhere, or requires a trick.
I have installed openCPU on an ubuntu xenial-16.04 instance. I'd like to lengthen the timelimit.post value as instructed in the /etc/opencpu/server.conf file. Trouble is I can't find it.
ubuntu@ip-x-x-x-x:/usr/lib/opencpu$ ls -a
. .. library rapache scripts
Maybe please check again to see if you don't find /etc/opencpu/server.conf in the expected directory - i.e. because, as above in your output of ls -la /etc/opencpu/, the server.conf file is listed being there. Note though the owner is root so take that into account when you try to open+edit the file.