Could you please recommend best ftp server for ubuntu server 10.04
Regards, Alexey Zakharov.
You should add to your question details of what you are providing a file transfer service for. Different servers have features that may be better for particular use cases.
If you are providing the services so your users can upload content and your users don't specifically need the FTP protocol, also consider the SFPC/SCP protocols provided by OpenSSH. These have advantages of over most standard implementations of FTP:
There are several command line clients available in just about all unix-a-like OSs (graphical ones easily available too, sometimes available by default or integrated into the main filemanager) and there are good clients for Windows too (WinSCP or FileZilla, both of which are available as portable apps).
Obviously if you are setting up an FTP service for people to download from SFTP or SCP are probably not suitable (but I would use HTTP(S) for that instead these days) and not all Windows users will be able/willing to install a new client application (though the availability of "portable" clients reduces this potential issue a little).
Edit: one other advantage is that you probably already have OpenSSH installed and configured to allow SFTP/SCP for correctly authenticated users, so you have no need to add and manage a new service.