How to upgrade my Android from Linux? Using Asus Zenfone 5, which I want to upgrade to Android Lollipop. 

The instructions say that I have to copy the OTA files to my SD card from my PC, but unfortunately I use Linux (ubuntu and mint). I cannot connect to my sd card via the usb cable. Is there any way to copy the files to the SD card from my Linux platform? Otherwise, can I use dropbox to get the file to the SD card somehow?
The answers given were great but I felt something needed to be added: If you boot into Android, you should be able to download the OTA file directly from your web browser.