Updating Opera to Version 11.5! (Again to Version 11.61.1250)

I am currently updating the Opera software to Version 11.5 codenamed Swordfish. Opera is a standards compliant software with a history of introducing innovations liked tabbed browsing and speed dial.

Further reading: Inquirer.net

And click here for an impressive list of the changes in 11.50 Swordfish edition.

Feb 19, 2012: I will be upgrading to version 11.61today! How time flies!
The default software manager spents a long time to install the downloaded file. So I have to do a manual install:

sudo dpkg -i opera_11.61.1250_amd64.deb 
(Reading database ... 677957 files and directories currently installed.)
Preparing to replace opera 11.52.1100 (using opera_11.61.1250_amd64.deb) ...
Unpacking replacement opera ...
Setting up opera (11.61.1250) ...
Error in file "/usr/share/applications/gnumeric.desktop": "zz-application/zz-winassoc-xls" is an invalid MIME type ("zz-application" is an unregistered media type)
Updating software catalog...this may take a moment.
Software catalog update was successful.