where to find postmaster.pid & how to set ticket ID to another starting value

where to find postmaster.pid & how to set ticket ID to another starting value

Dear all,
I try to follow the instructions given by another FAQ section to set the ticket ID to another starting values. However, since I use Linux/Ubunto the commands given in the FAQ (./ psql -U postgres -p 65432 -d servicedesk) are resulting in an error message " could not connect to server". I'm not familiar with postgres at all, so the syntax in Linux might be slightly different..
While I tried to find out the reason I found as well the pgsql/data file it completely blockked (mode 700) but this seems not to be the problem. In parallel I was looking for the postmaster.pid to get the webmin module working - no success.

What did I wrong ?

BR/GJW

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