Problem installing on ubuntu ("No module named _gv")

I am aware that I left out lots of details, please let me know which are the ones you need.

Many thanks.

Can you give the output of:

lsb_release -a; uname -a

Thanks

Thank you for your prompt response. The following is the output:

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 10.04.3 LTS
Release: 10.04
Codename: lucid
Linux my-ubuntu 2.6.32-38-generic #83-Ubuntu SMP Wed Jan 4 11:12:07 UTC 2012 x86_64 GNU/Linux

Ok, what is the output of:

sudo apt-get clean; sudo apt-get update; sudo apt-get install graphviz

Thanks

For sudo apt-get update, the last bit of the output:

Fetched 1,965kB in 2s (940kB/s)
Reading package lists... Done
W: GPG error: http://packages.medibuntu.org lucid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EBC26B60C5A2783
W: Duplicate sources.list entry http://archive.canonical.com/ lucid/partner Packages (/var/lib/apt/lists/archive.canonical.com_dists_lucid_partner_binary-amd64_Packages)
W: Duplicate sources.list entry http://archive.canonical.com/ lucid/partner Packages (/var/lib/apt/lists/archive.canonical.com_dists_lucid_partner_binary-amd64_Packages)
W: Duplicate sources.list entry http://archive.canonical.com/ lucid/partner Packages (/var/lib/apt/lists/archive.canonical.com_dists_lucid_partner_binary-amd64_Packages)

Then, for sudo apt-get install graphviz:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  graphviz-doc
The following NEW packages will be installed
  graphviz
0 upgraded, 1 newly installed, 0 to remove and 44 not upgraded.
Need to get 435kB of archives.
After this operation, 1,208kB of additional disk space will be used.
Get: 1 http://gb.archive.ubuntu.com/ubuntu/ lucid/main graphviz 2.20.2-8ubuntu3 [435kB]
Fetched 435kB in 0s (820kB/s)
Selecting previously deselected package graphviz.
(Reading database ... 207112 files and directories currently installed.)
Unpacking graphviz (from .../graphviz_2.20.2-8ubuntu3_amd64.deb) ...
Processing triggers for man-db ...
Setting up graphviz (2.20.2-8ubuntu3) ...

Thanks again!

sudo apt-get --quiet update && sudo apt-get --yes --quiet --allow-unauthenticated install medibuntu-keyring

Will import the medibuntu keyring which is part of the medibuntu repo adding process (no idea why you missed that out but it is easily fixed)

Can you give the output of:

grep -i partner /etc/apt/sources.list

Thanks

OK carried out your suggested nifty fix, big thanks.

Output of grep -i partner /etc/apt/sources.list

## 'partner' repository.
# deb http://archive.canonical.com/ubuntu lucid partner
# deb-src http://archive.canonical.com/ubuntu lucid partner
deb http://archive.canonical.com/ lucid partner
deb http://archive.canonical.com/ lucid partner
deb http://archive.canonical.com/ lucid partner
deb http://archive.canonical.com/ lucid partner

ok run:

gksudo gedit /etc/apt/sources.list

and delete THREE of the:

deb http://archive.canonical.com/ lucid partner

lines. Save the new file, close gedit then run:

sudo apt-get update. Is it smooth now?

Many many thanks, it is smooth now. But sadly "import gv" still doesn't work in python terminal...?

http://stackoverflow.com/questions/2133767/using-python-graphviz-importerror-no-module-named-gv
https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/556874