Alternate ISOs are for low-RAM PCs. Computers with less than 700 MB of RAM are considered low-RAM computers. Here is a screenshot of the alternate installer. Instructions are here.
Pleae check your download with md5sum
Please take time to read the Release Notes.
64 bit version for Intel or AMD computers. Most PCs older than about 2007 are not 64-bit compatible,
64 bit version for Intel Mac. If you don't have a 64-bit processor you can download the 32 bit version.
Other images and download locations
All images of the latest Lubuntu version for different PC architectures are available on the download overview page. Thanks to phillw and Lafibre we have secondary download servers here: Server 1, Server 2.
Older chipsets (CPUs)
Previous releases are here.
Installing with graphical interface on low-RAM systems
On the 'Desktop ISO', the graphical installer Ubiquity requires about 700-750 MB of RAM to run. This requirement does not include the RAM required to run the LiveCD (200 MB). So running the graphical installer by using the option 'Try Lubuntu' in the installer requires more RAM than selecting it from the boot menu.
Types of installation
* Desktop (Graphical Installer) - These versions are suitable for PC's with over 700 MB of RAM. Do not try to install 64 bit on a 32 bit machine. Installing 32 bit onto 64 bit is safe.
* Alternate: a non-graphical installer image used for computers with less than 4.3GB hard disk space and below 700MB RAM. Use the alternate versions for non-standard setups.
* Minimal install: Using the minimal ISO, it is possible to install and run lubuntu-core on a PC with only 64 MB of RAM. 128 MB of RAM are considered the minimal requirements for a usable Lubuntu Desktop system. Even with 128 MB, you may find that Chromium needs more resources than your computer has. Whilst it is the leanest 'main-stream' browser, there is a minimal browser called xombrero. It is not available from the Ubuntu Universe repository'