problems with update

Hi everybody,

maybe anybody can help me...

If I start my XMBC it shows Frodo 12.1 while booting... Current Stable Release seems to be: 12.2 “Frodo”
so I tried to update...

using putty I get the following messages:

login as: root
root@192.168.1.xx's password:
AppleTV:~ root# apt-get update
Ign http://repo666.ultrasn0w.com ./ Release.gpg
Hit http://repo666.ultrasn0w.com ./ Release
Err http://mirrors.xbmc.ord ./ Release.gpg
NetDB: Open nodename nor servname provided, or not known
Ign http://repo666.ultrasn0w.com ./ Packages/DiffIndex
Hit http://apt.saurik.com ios/550.58 Release.gpg
Get:1 http://apt.modmyi.com stable Release.gpg [189B]
Ign http://mirrors.xbmc.ord ./ Release
Ign http://mirrors.xbmc.ord ./ Packages
Ign http://mirrors.xbmc.ord ./ Packages
Err http://mirrors.xbmc.ord ./ Packages
NetDB: Open nodename nor servname provided, or not known
Hit http://repo666.ultrasn0w.com ./ Packages
Hit http://apt.saurik.com ios/550.58 Release
Get:2 http://apt.modmyi.com stable Release [1341B]
Ign http://apt.saurik.com ios/550.58/main Packages/DiffIndex
Get:3 http://apt.thebigboss.org stable Release.gpg [197B]
Hit http://apt.saurik.com ios/550.58/main Packages
Hit http://apt.awkwardtv.org stable Release.gpg
Get:4 http://apt.modmyi.com stable/main Packages/DiffIndex [53.3kB]
Get:5 http://nitosoft.com Release.gpg [487B]
Get:6 http://cydia.zodttd.com stable Release.gpg [189B]
Get:7 http://apt.thebigboss.org stable Release [471B]
Hit http://apt.awkwardtv.org stable Release
Get:8 http://cydia.zodttd.com stable Release [1667B]
Get:9 http://apt.thebigboss.org stable/main Packages/DiffIndex [44.2kB]
Hit http://nitosoft.com Release
Hit http://apt.awkwardtv.org stable/main Packages/DiffIndex
Err http://nitosoft.com Release

Get:10 http://apt.modmyi.com stable/main 2013-05-14-1543.26+2013-05-25-2122.29.pdiff [30.1kB]
Get:11 http://cydia.zodttd.com stable/main Packages/DiffIndex [53.0kB]
Get:12 http://nitosoft.com Release [295B]
Ign http://nitosoft.com Release
Get:13 http://apt.thebigboss.org stable/main 2013-05-14-1543.07+2013-05-26-1617.47.pdiff [13.5kB]
Ign http://nitosoft.com Packages/DiffIndex
Get:14 http://apt.modmyi.com stable/main 2013-05-14-1543.26+2013-05-25-2122.29.pdiff [30.1kB]
Hit http://nitosoft.com Packages
Get:15 http://apt.modmyi.com stable/main 2013-05-14-1543.26+2013-05-25-2122.29.pdiff [30.1kB]
Get:16 http://apt.thebigboss.org stable/main 2013-05-14-1543.07+2013-05-26-1617.47.pdiff [13.5kB]
Get:17 http://apt.thebigboss.org stable/main 2013-05-14-1543.07+2013-05-26-1617.47.pdiff [13.5kB]
Get:18 http://cydia.zodttd.com stable/main 2013-05-13-1900.28+2013-05-24-2100.09.pdiff [12.2kB]
Get:19 http://cydia.zodttd.com stable/main 2013-05-13-1900.28+2013-05-24-2100.09.pdiff [12.2kB]
Get:20 http://cydia.zodttd.com stable/main 2013-05-13-1900.28+2013-05-24-2100.09.pdiff [12.2kB]
Fetched 211kB in 33s (6356B/s)
W: GPG error: http://nitosoft.com Release: The following signatures were invalid: KEYEXPIRED 1355702829 KEYEXPIRED 1355702829 KEYEXPIRED 1355702829
W: Failed to fetch http://mirrors.xbmc.ord/apt/atv2/./Release.gpg NetDB: Open nodename nor servname provided, or not known
W: Failed to fetch http://mirrors.xbmc.ord/apt/atv2/./Packages.gz NetDB: Open nodename nor servname provided, or not known
E: Some index files failed to download, they have been ignored, or old ones used instead.


AppleTV:~ root# apt-get install org.xbmc.xbmc-atv2
Reading package lists... Done
Building dependency tree
Reading state information... Done
org.xbmc.xbmc-atv2 is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 27 not upgraded.
W: Duplicate sources.list entry http://apt.awkwardtv.org stable/main Packages (/var/lib/apt/lists/apt.awkwardtv.org_dists_stable_main_binary-iphoneos-arm_Packages)
W: You may want to run apt-get update to correct these problems


apt-get update does not solve that problems..

what do I have to do...
thanks in advance