Opera has released a version of Opera Mobile 10 for Linux,and provide the deb package.But this deb package is only for i386.Here is how to install Opera Mobile 10 on x86_64 Ubuntu.

First,download the deb package for Opera Mobile

Open up a terminal window from Applications->Accessories menu and run:

sudo apt-get install ia32-libs

Force to install the deb for i386 on amd64 system
(You need to navigate to the directory where you saved the just downloaded deb package first,in my case it’s cd Downloads,and then execute following command):

sudo dpkg -i --force-architecture OperaMobileLinux_35.deb

Finally,run this command:

sudo ln -s /usr/lib/libopera.so /usr/bin/

Now,launch Open Mobile from Applications->Internet menu!