Arvados

On Ubuntu 14.04:

sguthrie@sguthrie-System-Product-Name:~$ apt-cache policy python-pycurl
python-pycurl:
  Installed: (none)
  Candidate: 7.19.5.3-2
  Version table:
     7.19.5.3-2 0
        500 http://apt.arvados.org/ precise/main amd64 Packages
     7.19.5.3-1 0
        500 http://apt.arvados.org/ precise/main amd64 Packages
     7.19.5.2-2 0
        500 http://apt.arvados.org/ precise/main amd64 Packages
     7.19.5.1-2 0
        500 http://apt.arvados.org/ precise/main amd64 Packages
     7.19.5.1 0
        500 http://apt.arvados.org/ precise/main amd64 Packages
     7.19.3-0ubuntu3 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
sguthrie@sguthrie-System-Product-Name:~$ sudo apt-get install python-pycurl
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 python-pycurl : Depends: libtasn1-3 but it is not installable
E: Unable to correct problems, you have held broken packages.
sguthrie@sguthrie-System-Product-Name:~$ sudo apt-get install libtasn1-3
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libtasn1-3 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libtasn1-3' has no installation candidate
sguthrie@sguthrie-System-Product-Name:~$ apt-cache search libtasn
libtasn1-3-bin - transitional libtasn1-3-bin package
libtasn1-3-dev - transitional libtasn1-3-dev package
libtasn1-6 - Manage ASN.1 structures (runtime)
libtasn1-6-dbg - Manage ASN.1 structures (debugging symbols)
libtasn1-6-dev - Manage ASN.1 structures (development)
libtasn1-bin - Manage ASN.1 structures (binaries)