After upgrade, cannot login

[Mateo Guynn]

Upon upgrading to Ubuntu 15.04, I am not able to login.
It takes me to the login screen. When I login, the screen goes black, and then for no reason I'm on the login screen again. No invalid password, nothing.
1. My ubuntu version= 15.04
2. I do not know what package is causing this.
3. What I expected to happen: After typing in my login credetials, I would be taken to my desktop.
4. What actually happened: After typing in my credentials, I was returned to the login screen with no error messsages whatsoever.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14
ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
Uname: Linux 3.16.0-34-generic i686
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: i386
CrashDB: ubuntu
Date: Wed Jul 1 09:08:30 2015
InstallationDate: Installed on 2015-04-04 (87 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release i386 (20141022.1)
PackageArchitecture: all
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to vivid on 2015-07-01 (0 days ago)

[Brian Murray (brian-murray)]

There were a ton of errors contacting the us.archive.ubuntu.com mirror during your upgrade.

2015-06-30 21:20:09,283 ERROR IOError in cache.commit(): 'Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/b/base-files/base-files_7.2ubuntu9_i386.deb Could not resolve 'us.archive.ubuntu.com'
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/b/bash/bash_4.3-11ubuntu2_i386.deb Could not resolve 'us.archive.ubuntu.com'
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/s/systemd/libsystemd0_219-7ubuntu6_i386.deb Could not resolve 'us.archive.ubuntu.com'
Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/libc/libcap2/libcap2_2.24-6_i386.deb Could not resolve 'us.archive.ubuntu.com'

I would try logging in via a different desktop session and try running update-manager.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]