Using Tomboy as a simple Note tool already for a while,  I quite liked it not long ago.

But when I found it is written by C# ... -_-||  and recently it didn't work that well .  First, my Windows XP is replaced by  Windows7 in office;  Second, Macbook Pro replaced Ubuntu Notebook at home. Some  unexpected things happened:

• In windos7 , didn't support dotnet sdk 4.0, have to downgrade to 3.5 to make it work
• Ubuntu One remove web interface to manage notes, quite inconvenient
• written in C#, need install Mono first on Mac OX or Linux, I hate that
• Mobile version developing very slowly, still not able edit on Mobile

Then , I didn't spend too many time to decide to switch to EverNote :

• It's Mature and Powerful
• Support Web, OX,ISO, Windows, Android ...  However, not Linux.

But, there are a few alternative solution when using in Ubuntu (or Linux):

1. Just using the Web UI. (strong recommend)

Unlike the old Ubuntu One, EverNote's Web UI is very powerful, almost provide all function and is quite quick.

2. Install Windows version in wine

Could be a little slowly. But mainly , I don't like to use wine to install such kind of frequently used tool.

3. Install NixNote

NixNote is not developed by EverNote, but can synchronize with EverNote. KDE style , not elegant and a little slow.

sudo add-apt-repository ppa:vincent-c/nevernote
sudo apt-get update
sudo apt-get install nixnoet