failed to upgrade to ubuntu 14.04

[Ciprian]

ciprian@ciprian-XPS-M1330:~$ ubuntu-bug ubuntu-release-upgrader-core
ciprian@ciprian-XPS-M1330:~$ [4142:4142:0802/215916:ERROR:extension_error_reporter.cc(56)] Extension error: Package is invalid. Details: 'Cannot load extension with file or directory name _metadata. Filenames starting with "_" are reserved for use by the system.'.
[4142:4171:0802/215916:ERROR:extension_downloader.cc(114)] Can't read CRX file written for update at path /tmp/.com.google.Chrome.ZHsu0n
[13:40:0802/215923:ERROR:platform_thread_linux.cc(99)] Failed to set nice value of thread to -10

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.7
ProcVersionSignature: Ubuntu 3.11.0-26.45-generic 3.11.10.12
Uname: Linux 3.11.0-26-generic i686
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: i386
CrashDB: ubuntu
Date: Sat Aug 2 21:57:20 2014
InstallationDate: Installed on 2013-09-29 (308 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to saucy on 2014-08-03 (0 days ago)
VarLogDistupgradeTermlog:

[Ubuntu Foundations Team Bug Bot (crichton)]

You seem to have installed the cinnamon package on Ubuntu 13.10. Unfortunately, that package is not available yet for 14.04. To upgrade to Ubuntu 14.04 LTS you'll need to either wait for a fix for cinnamon to be available or uninstall the package and then upgrade.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]