You'll see some debugging info during this installation.
Do not worry unless told otherwise.
It seems your database install/upgrade went well and smoothly.  That's cool.
Please enjoy using Debian GForge.
Plugin 'scmsvn' already registered, skipping.
2
Syntax error on line 191 of /etc/apache2/conf.d/gforge.httpd.conf:
SSLCertificateFile takes one argument, SSL Server Certificate file (`/path/to/file' - PEM or DER encoded)
 failed!
dpkg: error processing gforge-plugin-scmsvn (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 gforge-plugin-scmsvn