Question: I have AAO110 (512ram, atom 270N)
What is best version of Ubuntu, if i need just web? UNR 10.04 was almost fine, but i wonder if there are better options now.

browser, blue-tooth, WiFi, long battery, no extra elements on screen (e.g. not like in Unity) while browser opened

Answer: 
You could also consider installing Truecrypt on your USB. Once installed, use TrueCrypt to create an encrypted container, which can be opened with the software on the key. Saves you time installing software on multiple computers, still leaving you with the encryption you wanted.

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**Update** [since 2014](https://opencryptoaudit.org/reports/TrueCrypt_Phase_II_NCC_OCAP_final.pdf), from [TrueCrypt site](http://truecrypt.sourceforge.net/):

> 
> **WARNING: Using TrueCrypt is not secure as it may contain unfixed security issues**
> 
> 
> This page exists only to help migrate existing data encrypted by TrueCrypt.  
> 
> The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP.
> 
> 
>
The problem with free solutions is that apart from a few, most of them are usually not well maintained or well supported. You have to wait for compatibility updates and bugs resolutions. It is also better to go for container encryption than drive or disk encryption, specially for external drives, as they are more flexible and easier to manage. If you are willing to spend a little, I can suggest **BestCrypt** containers. They are supported on Windows, Linux, Mac and even Android with a number of algorithms. Instead of encrypting your USB, you can create a container the size of your USB, external hard drives etc. and access them on each platform.