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I am trying to install PostGIS on Ubuntu 12.04 and I think everything is installed correctly except for postgresql. I followed this post. I get the following error and nothing I do seems to satisfy the unmet dependency.

dpkg: error processing /var/cache/apt/archives/postgresql-9.1-postgis_2.0.1-2~precise3_amd64.deb (--unpack):
 trying to overwrite '/usr/lib/postgresql/9.1/lib/rtpostgis-2.0.so', which is also in package postgresql-9.1-postgis2 2.0.0-1ubuntu1~ppa18~precise1
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)

A little help for this ubuntu/gis novice.

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Do you really need Postgres 9.2? –  R.K. Jan 18 '13 at 2:23
Is your PostgreSQL 9.2 64bits version? Because if PostGIS is 32bits version, maybe they don't "match". Few years ago I faced a weird and similar problem and finally it was that my PostgreSQL was 64 and PostGIS (in that moment it was 1.3.3 or 1.3.5 version) could not work over this version. I just switched Postgre to 32 bits. –  iamgin Jan 18 '13 at 10:10
First, thank you for the edit, I couldn't figure out why the error code split like that and I got frustrated trying to correct it. I am not sure what I need. I have been reading posts about PostGIS and thought I would install so that I can start learning and play with it. Any correction for installation would be greatly appreciated. –  LandArch Jan 18 '13 at 16:40
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3 Answers

Sharpie is alright, but recently UbuntuGis team came in with some stable packages: https://launchpad.net/~ubuntugis/+archive/ppa?field.series_filter=precise, try them.

apt-add-repository deb http://ppa.launchpad.net/ubuntugis/ppa/ubuntu precise main 
apt-add-repository deb-src http://ppa.launchpad.net/ubuntugis/ppa/ubuntu precise main
apt-get install postgis

Also, http://postgis.net/source has a good build manual, till today I used it more often than package installation.

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This method also requires adding the repo key or you'll get a warning and possible a fail that the repo can't be authenticated. sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 314DF160 OR use the ppa method –  wildintellect Jul 29 '13 at 23:52
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I've been refining installation instructions for PostGIS on Ubuntu which pulls from the Postgresql Apt-repository rather than compiling from source.

This will install PostgreSQL 9.3, PostGIS 2.1, PGAdmin3 1.18, and QGIS 2.0

The document is posted in this folder:


Any feedback is appreciated.

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up vote -1 down vote accepted

I followed this post and it works like a charm.

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It would be helpful to include highlights and key points from the post, instead of just a link. That way the answer will still be here if the link disappears into 404-land. –  user3461 Nov 5 '13 at 19:05
I agree and would, except for me as a newbie and not comfortable with writing code or the Linux command line the whole post was needed on my end. I could just copy and past the whole link. –  LandArch Nov 6 '13 at 14:13
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