Спасибо за быстрый ответ, но к сожалению не помогло, вот содержимое указанного Вами файла:
Acquire::http::proxy "http://192.168.1.100:808/";
Acquire::ftp::proxy "http://192.168.1.100:808/";
Acquire::https::proxy "http://192.168.1.100:808/";
Комп перезагружал - все по прежнему: центр приложений не коннектится, терминал тоже:
asmolka@asmolka-RV408:~$ sudo apt-get update
[sudo] password for asmolka:
Ign http://archive.canonical.com natty InRelease
Ign http://archive.ubuntu.com natty InRelease
Ign http://extras.ubuntu.com natty InRelease
Hit http://archive.canonical.com natty Release.gpg
Get:1 http://extras.ubuntu.com natty Release.gpg [72 B]
Hit http://archive.canonical.com natty Release
Hit http://extras.ubuntu.com natty Release
Ign http://archive.ubuntu.com natty-updates InRelease
Ign http://archive.ubuntu.com natty-security InRelease
Ign http://archive.ubuntu.com natty Release.gpg
Hit http://archive.canonical.com natty/partner i386 Packages
Hit http://extras.ubuntu.com natty/main Sources
Err http://archive.ubuntu.com natty-updates Release.gpg
Bad header line
Ign http://archive.canonical.com natty/partner TranslationIndex
Get:2 http://extras.ubuntu.com natty/main i386 Packages [14 B]
Get:3 http://archive.ubuntu.com natty-security Release.gpg [198 B]
Ign http://extras.ubuntu.com natty/main TranslationIndex
32% [2 Packages bzip2 0 B] [3 Release.gpg 0 B/198 B 0%] [Waiting for headers] [bzip2: (stdin) is not a bzip2 file.
Ign http://archive.ubuntu.com natty Release
Ign http://archive.ubuntu.com natty-updates Release
Get:4 http://archive.ubuntu.com natty-security Release [27.2 kB]
Ign http://archive.ubuntu.com natty/main i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-security Release
Ign http://archive.canonical.com natty/partner Translation-en_US
Ign http://archive.canonical.com natty/partner Translation-en
Err http://extras.ubuntu.com natty/main i386 Packages
Bad header line
Ign http://archive.ubuntu.com natty/restricted i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty/universe i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty/multiverse i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty/main TranslationIndex
Ign http://archive.ubuntu.com natty/multiverse TranslationIndex
Ign http://extras.ubuntu.com natty/main Translation-en_US
Ign http://extras.ubuntu.com natty/main Translation-en
Ign http://archive.ubuntu.com natty/restricted TranslationIndex
Ign http://archive.ubuntu.com natty/universe TranslationIndex
Ign http://archive.ubuntu.com natty-updates/main i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-updates/restricted i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-updates/universe i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-updates/multiverse i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-updates/main TranslationIndex
Ign http://archive.ubuntu.com natty-updates/multiverse TranslationIndex
Ign http://archive.ubuntu.com natty-updates/restricted TranslationIndex
Ign http://archive.ubuntu.com natty-updates/universe TranslationIndex
Hit http://archive.ubuntu.com natty/main i386 Packages
Ign http://archive.ubuntu.com natty-security/main i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-security/restricted i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-security/universe i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-security/multiverse i386 Packages/DiffIndex
Ign http://archive.ubuntu.com natty-security/main TranslationIndex
Ign http://archive.ubuntu.com natty-security/multiverse TranslationIndex
Ign http://archive.ubuntu.com natty-security/restricted TranslationIndex
Ign http://archive.ubuntu.com natty-security/universe TranslationIndex
Hit http://archive.ubuntu.com natty/restricted i386 Packages
Hit http://archive.ubuntu.com natty/universe i386 Packages
Hit http://archive.ubuntu.com natty/multiverse i386 Packages
Hit http://archive.ubuntu.com natty-updates/main i386 Packages
Hit http://archive.ubuntu.com natty-updates/restricted i386 Packages
Hit http://archive.ubuntu.com natty-updates/universe i386 Packages
Hit http://archive.ubuntu.com natty-updates/multiverse i386 Packages
Hit http://archive.ubuntu.com natty-security/main i386 Packages
Hit http://archive.ubuntu.com natty-security/restricted i386 Packages
Hit http://archive.ubuntu.com natty-security/universe i386 Packages
Hit http://archive.ubuntu.com natty-security/multiverse i386 Packages
Ign http://archive.ubuntu.com natty/main Translation-en_US
Ign http://archive.ubuntu.com natty/main Translation-en
Ign http://archive.ubuntu.com natty/multiverse Translation-en_US
Ign http://archive.ubuntu.com natty/multiverse Translation-en
Ign http://archive.ubuntu.com natty/restricted Translation-en_US
Ign http://archive.ubuntu.com natty/restricted Translation-en
Ign http://archive.ubuntu.com natty/universe Translation-en_US
Ign http://archive.ubuntu.com natty/universe Translation-en
Ign http://archive.ubuntu.com natty-updates/main Translation-en_US
Ign http://archive.ubuntu.com natty-updates/main Translation-en
Ign http://archive.ubuntu.com natty-updates/multiverse Translation-en_US
Ign http://archive.ubuntu.com natty-updates/multiverse Translation-en
Ign http://archive.ubuntu.com natty-updates/restricted Translation-en_US
Ign http://archive.ubuntu.com natty-updates/restricted Translation-en
Ign http://archive.ubuntu.com natty-updates/universe Translation-en_US
Ign http://archive.ubuntu.com natty-updates/universe Translation-en
Ign http://archive.ubuntu.com natty-security/main Translation-en_US
Ign http://archive.ubuntu.com natty-security/main Translation-en
Ign http://archive.ubuntu.com natty-security/multiverse Translation-en_US
Ign http://archive.ubuntu.com natty-security/multiverse Translation-en
Ign http://archive.ubuntu.com natty-security/restricted Translation-en_US
Ign http://archive.ubuntu.com natty-security/restricted Translation-en
Ign http://archive.ubuntu.com natty-security/universe Translation-en_US
Ign http://archive.ubuntu.com natty-security/universe Translation-en
Fetched 285 B in 27s (10 B/s)
W: GPG error: http://archive.ubuntu.com natty-security Release: The following signatures were invalid: NODATA 1 NODATA 2
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/Release.gpg Bad header line
W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages Bad header line
E: Some index files failed to download. They have been ignored, or old ones used instead.
asmolka@asmolka-RV408:~$ sudo add-apt-repository ppa:sun-java-community-team/sun-java6
Error reading https://launchpad.net/api/1.0/~sun-java-community-team/+archive/sun-java6: <urlopen error [Errno -2] Name or service not known>
asmolka@asmolka-RV408:~$ sudo apt-get install sun-java6
Reading package lists... Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_multiverse_binary-i386_Packages
E: The package lists or status file could not be parsed or opened.
Я смотрю что он вроде что-то там загружает, а потом какие-то хедеры ему не нравятся. Может есть еще какие варианты? Спасибо за помощь