Postgresql 10.4 installation issues on Ubuntu 14.05

sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'

sudo apt-get install wget ca-certificates
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install postgresql-10

and get some errors:
 

Removing obsolete dictionary files:

* No PostgreSQL clusters exist; see "man pg_createcluster"

Processing triggers for ureadahead (0.100.0-16) ...

Setting up postgresql-10 (10.4-2.pgdg14.04+1) ...

Creating new PostgreSQL cluster 10/main ...

/usr/lib/postgresql/10/bin/initdb -D /var/lib/postgresql/10/main --auth-local peer --auth-host md5

The files belonging to this database system will be owned by user "postgres".

This user must also own the server process.

The database cluster will be initialized with locale "en_US.UTF-8".

The default database encoding has accordingly been set to "UTF8".

The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/postgresql/10/main ... ok

creating subdirectories ... ok

selecting default max_connections ... 100

selecting default shared_buffers ... 128MB

selecting dynamic shared memory implementation ... posix

creating configuration files ... ok

running bootstrap script ... ok

performing post-bootstrap initialization ... ok

syncing data to disk ... ok

Success. You can now start the database server using:

    /usr/lib/postgresql/10/bin/pg_ctl -D /var/lib/postgresql/10/main -l logfile start

Ver Cluster Port Status Owner    Data directory              Log file

10  main    5432 down   postgres /var/lib/postgresql/10/main /var/log/postgresql/postgresql-10-main.log

update-alternatives: using /usr/share/postgresql/10/man/man1/postmaster.1.gz to provide /usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode

* Starting PostgreSQL 10 database server                                                                                                                                                                                                     * Failed to issue method call: Unit postgresql@10-main.service failed to load: No such file or directory. See system logs and 'systemctl status postgresql@10-main.service' for details.

                                                                                                                                                                                                                                      [fail]

invoke-rc.d: initscript postgresql, action "start" failed.

dpkg: error processing package postgresql-10 (--configure):

subprocess installed post-installation script returned error exit status 1

dpkg: dependency problems prevent configuration of postgresql:

postgresql depends on postgresql-10; however:

  Package postgresql-10 is not configured yet.

dpkg: error processing package postgresql (--configure):

dependency problems - leaving unconfigured

Processing triggers for libc-bin (2.19-0ubuntu6.14) ...

No apport report written because the error message indicates its a followup error from a previous failure.

                                                                                                          Errors were encountered while processing:

postgresql-10

postgresql

E: Sub-process /usr/bin/dpkg returned an error code (1)

thanks for any reponse.