1. deb http://deb.opera.com/opera/ stable non-free
   deb http://deb.opera.com/opera-beta/ stable non-free


W: Failed to fetch http://deb.opera.com/opera/dists/stable/Release  Unable to find expected entry  non-free/source/Sources in Meta-index file (malformed Release file?)

W: Failed to fetch http://deb.opera.com/opera-beta/dists/stable/Release  Unable to find expected entry  non-free/source/Sources in Meta-index file (malformed Release file?)

....
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2. sudo apt-get update
   sudo apt-get install opera

...

Preconfiguring packages ...
Selecting previously deselected package opera.
(Reading database ... 342314 files and directories currently installed.)
Unpacking opera (from .../opera_11.61.1250_i386.deb) ...
Processing triggers for shared-mime-info ...
Unknown media type in type 'all/all'

Unknown media type in type 'all/allfiles'

Unknown media type in type 'uri/mms'

Unknown media type in type 'uri/mmst'

Unknown media type in type 'uri/mmsu'

Unknown media type in type 'uri/pnm'

Unknown media type in type 'uri/rtspt'

Unknown media type in type 'uri/rtspu'

Unknown media type in type 'fonts/package'

Unknown media type in type 'interface/x-winamp-skin'



...........
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Setting up opera (11.61.1250) ...
update-alternatives: using /usr/bin/opera to provide /usr/bin/x-www-browser (x-www-browser) in auto mode.
update-alternatives: using /usr/bin/opera to provide /usr/bin/gnome-www-browser (gnome-www-browser) in auto mode.
Warning in file "/usr/share/applications/firefox.desktop": usage of MIME type "x-scheme-handler/http" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)
Warning in file "/usr/share/applications/firefox.desktop": usage of MIME type "x-scheme-handler/https" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)
Warning in file "/usr/share/applications/firefox.desktop": usage of MIME type "x-scheme-handler/ftp" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)
Warning in file "/usr/share/applications/firefox.desktop": usage of MIME type "x-scheme-handler/chrome" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)
Warning in file "/usr/share/applications/opera-browser.desktop": usage of MIME type "x-scheme-handler/http" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)
Warning in file "/usr/share/applications/opera-browser.desktop": usage of MIME type "x-scheme-handler/https" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)
Warning in file "/usr/share/applications/opera-browser.desktop": usage of MIME type "x-scheme-handler/ftp" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)
Warning in file "/usr/share/applications/opera-browser.desktop": usage of MIME type "x-scheme-handler/mailto" is discouraged (the use of "x-scheme-handler" as media type is strongly discouraged in favor of a subtype of the "application" media type)


.......
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@work:~$ opera

** (<unknown>:4570): CRITICAL **: murrine_style_draw_arrow: assertion `height >= -1' failed

** (<unknown>:4570): CRITICAL **: murrine_style_draw_arrow: assertion `height >= -1' failed