display resolution resets automatically to retina

[Leander]

I've installed Ubuntu 12.04. Now a lot of problems occur.

1) After reboot or changing Parallels desktop window the resolution resets to retina. What may be wrong? Any help?
2) I cannot add language support for German. This is the error massage:

Failed to fetch http://us.archive.ubuntu.com/ubuntu.../language-pack-de-base_12.04+20120508_all.deb 404 Not Found [IP: 91.189.91.15 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu...ck-de/language-pack-de_12.04+20120618_all.deb 404 Not Found [IP: 91.189.91.15 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu...age-pack-gnome-de-base_12.04+20120508_all.deb 404 Not Found [IP: 91.189.91.15 80]
Failed to fetch http://us.archive.ubuntu.com/ubuntu...language-pack-gnome-de_12.04+20120618_all.deb 404 Not Found [IP: 91.189.91.15 80]
Failed to fetch http://security.ubuntu.com/ubuntu/p...ale-de_15.0+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 91.189.92.201 80]
Failed to fetch http://security.ubuntu.com/ubuntu/p...ale-de_15.0+build1-0ubuntu0.12.04.1_amd64.deb 404 Not Found [IP: 91.189.92.201 80]

I'm desperately waiting for any help.