Something

user@machine:~/local-packages/postgresql$ sudo dpkg -i postgresql-client-common_81_all.deb postgresql-client-8.3_8.3~beta4-1_i386.deb postgresql-common_81_all.deb postgresql-8.3_8.3~beta4-1.deb
[sudo] password for user:
Selecting previously deselected package postgresql-client-common.
(Reading database ... 99987 files and directories currently installed.)
Unpacking postgresql-client-common (from postgresql-client-common_81_all.deb) ...
Selecting previously deselected package postgresql-client-8.3.
Unpacking postgresql-client-8.3 (from postgresql-client-8.3_8.3~beta4-1_i386.deb) ...
Selecting previously deselected package postgresql-common.
Unpacking postgresql-common (from postgresql-common_81_all.deb) ...
dpkg: error processing postgresql-8.3_8.3~beta4-1.deb (--install):
 cannot access archive: No such file or directory
Setting up postgresql-client-common (81) ...
dpkg: dependency problems prevent configuration of postgresql-client-8.3:
 postgresql-client-8.3 depends on libpq5 (>= 8.3~beta1); however:
  Version of libpq5 on system is 8.2.5-4.
dpkg: error processing postgresql-client-8.3 (--install):
 dependency problems - leaving unconfigured
Setting up postgresql-common (81) ...
Adding user postgres to group ssl-cert

Errors were encountered while processing:
 postgresql-8.3_8.3~beta4-1.deb
 postgresql-client-8.3