Version upgrade of Kubuntu did not continue past MSCoreFonts so was closed. Restarting upgrade does not work.

[jurbina.com]

Upgrade via Muon Update Manager to 12.10 did not finish, it would not continue past MSCoreFonts install.
No error was given.
After leaving it overnight without any change I closed Update Manager and confirmed that I did not want to continue Upgrade.
Upgrade will not restart normally; at 'Preparing to upgrade' I receive: 'Preparing the upgrade failed'.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubuntu-release-upgrader-core 1:0.190.6
ProcVersionSignature: Ubuntu 3.2.0-43.68-generic 3.2.42
Uname: Linux 3.2.0-43-generic x86_64
NonfreeKernelModules: vboxpci vboxnetadp vboxnetflt vboxdrv nvidia
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Fri May 24 08:48:35 2013
InstallationDate: Installed on 2012-05-26 (362 days ago)
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120423)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to quantal on 2013-05-24 (0 days ago)
VarLogDistupgradeTermlog:

modified.conffile..etc.update.manager.release.upgrades: [modified]
mtime.conffile..etc.update.manager.release.upgrades: 2013-05-23T22:14:53.899232

[Sasa Paporovic (melchiaros)]

In Mainlog:

2013-05-24 08:48:21,953 ERROR openCache() failed: 'E:Could not open file /var/lib/apt/lists/it.archive.ubuntu.com_ubuntu_dists_quantal-updates_main_binary-i386_Packages - open (24: Too many open files), E:Could not open file /var/lib/apt/lists/it.archive.ubuntu.com_ubuntu_dists_quantal-updates_multiverse_binary-amd64_Packages - open (24:
.
..
...
2013-05-24 08:48:21,954 ERROR self.prepared() failed

[Sasa Paporovic (melchiaros)]

Thank you for reporting.

This issue is known and your report will be marked as dublicate of the original report.