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Ubuntu Quietly Raises Install Image Size to 2GB (omgubuntu.co.uk)
Joey-Elijah Sneddon, reporting for OMGUbuntu: You can expect to see a larger Ubuntu desktop installation image by the time the Yakkety Yak yips out. Developers are currently debating the exact size limits that official flavours will adhere to, with some favouring a 2GB hard limit while others are looking to go full-DVD size at 4.7GB+. Canonical's Steven Langasek explains the plans for Ubuntu 16.10 Yakkety Yak: "I've finally gone ahead and bumped the limit on Ubuntu desktop images to 2GB for a minimally-sized USB stick; this gives us a new limit that I think we will care about, while also leaving us headroom so we're not constantly fighting it back down to the line." The Ubuntu ISO is supposed to be around the 1GB mark but has creeped past this in recent releases. The current Ubuntu 16.04 LTS desktop .iso is 1.4GB.
It's probably limited to 2GB to stay compatible with FAT32 max file size. I guess some people mount .iso files or something like that.
Ubuntu's not just for the developed world. There are many places where a 2 GB USB stick costs more than the average daily wage.
There is no reason not to have different ISO sizes. I would love to have an ISO that fits on a CD AND one that is 32GByte big.
If 2GB is a "debatable" target, the next "step up" is a 4GB USB, not a 4.7GB DVD/ISO image.
Actually, just under 4GB if you are going to create an ISO image. You need to leave a little room on the USB stick for boot sectors, UEFI boot partitions, and other overhead so the end user can turn the ISO into a bootable USB stick. So either set the limit for the ISO image at 1.9GB or 3.9GB, but not 4.7GB.
Also, if the ISO itself is bigger than 4GB, it can't be stored on a FAT-32 formatted USB stick. Many people still use FAT-32 for cross-platform storage devices.
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