package postgresql-8.3 8.3.5-0ubuntu8.10 failed to install/upgrade: subprocess post-installation script returned error exit status 1

Binary package hint: postgresql-8.3

Tryied to start PostgreSQL-8.3 (/etc/init.d/start) right after Hardy->Intrepid upgrade, but got this error:

/etc/init.d/postgresql-8.3 start
 * Starting PostgreSQL 8.3 database server * The PostgreSQL server failed to start. Please check the log output:
2008-11-10 19:20:53 PST LOG: SSL certificate revocation list file "root.crl" not found, skipping: No such file or directory
2008-11-10 19:20:53 PST DETAIL: Certificates will not be checked against revocation list.
2008-11-10 19:20:53 PST FATAL: could not create shared memory segment: Invalid argument
2008-11-10 19:20:53 PST DETAIL: Failed system call was shmget(key=5432001, size=38207488, 03600).
2008-11-10 19:20:53 PST HINT: This error usually means that PostgreSQL's request for a shared memory segment exceeded your kernel's SHMMAX parameter. You can either reduce the request size or reconfigure the kernel with larger SHMMAX. To reduce the request size (currently 38207488 bytes), reduce PostgreSQL's shared_buffers parameter (currently 4096) and/or its max_connections parameter (currently 103).
 If the request size is already small, it's possible that it is less than your kernel's SHMMIN parameter, in which case raising the request size or reconfiguring SHMMIN is called for.
 The PostgreSQL documentation contains more information about shared memory configuration.

Then reinstall shows same problem, but also includes worrisome message:
...
Setting up postgresql-common (90) ...
supported_versions: WARNING: Unknown Ubuntu release: 8.10

ProblemType: Package
Architecture: i386
DistroRelease: Ubuntu 8.10
ErrorMessage: subprocess post-installation script returned error exit status 1
Package: postgresql-8.3 8.3.5-0ubuntu8.10
SourcePackage: postgresql-8.3
Title: package postgresql-8.3 8.3.5-0ubuntu8.10 failed to install/upgrade: subprocess post-installation script returned error exit status 1
Uname: Linux 2.6.27-7-generic i686