Picasa for Linux is no Longer Supported by Google. Picasa for Linux is not a native Linux application anymore. But, for now Picasa will uses WINE which comes bundled with it (so the user doesn’t have to install WINE), though it does have some tweaks to make it integrate better with Linux. Well, even this google officially drop picasa for linux.
For ubuntu users who have already download and using Picasa for Linux can continue to use it, but there will be no further updates and also, Picasa for Linux can no longer be downloaded it via officially picasa download page http://picasa.google.com/. For now, picasa for linux is still available in the Google Ubuntu repository though.
Here’s a quote announcement about picasa for linux is no longer supported by google:
We launched a WINE-based version of Picasa for Linux in 2006 as a Google Labs project. As we continue to enhance Picasa, it has become difficult to maintain parity on the Linux version. So today, we’re deprecating Picasa for Linux and will not be maintaining it moving forward. Users who have downloaded and installed older versions of Picasa for Linux can continue to use them, though we won’t be making any further updates
The last Picasa for Linux version is 3.0, while Picasa for Windows has already reached version 3.9 and even though the Windows version is not officially supported on Linux, you can still use it and even get the Google+ integration workingsource: webupd8