chyba downloadu pri upgradu ubuntu server na saucy

[deii]

Ahoj, pokousim se o upgrade ubuntu server z raring na saucy. Pri stahovani openjdk-7-jdk se to vzdy zasekne na 99% a pak se o stazeni archivu pokousi stale dokola stejnym zpusobem. Jine archivy stahuje v pohode. Muzete mi nekdo, prosim, helfnout? 

Get:1 http://cz.archive.ubuntu.com/ubuntu/ saucy/main openjdk-7-jdk amd64 7u25-2.3.12-4ubuntu3 [16.6 MB]
4% [1 openjdk-7-jdk 16.5 MB/16.6 MB 99%]

[deii]

Zrejme je spatne nastavena hlavicka 'last-modified'.


wget -c http://security.ubuntu.com/ubuntu/pool/universe/o/openjdk-6/openjdk-6-jre-headless_6b27-1.12.6-1ubuntu2.1_amd64.deb

Last-modified header invalid -- time-stamp ignored.
2013-12-12 14:34:54 (308 KB/s) - âopenjdk-6-jre-headless_6b27-1.12.6-1ubuntu2.1_amd64.debâ saved [25555816/25555816]


Nejaky workaround pro do-release-upgrade?