This title is misleading. The article is a post on a bulletin board by someone stating two facts: a. Canonical "claims" they provide Long Term Support b. That

This title is misleading. The article is a post on a bulletin board by someone stating two facts: a. Canonical "claims" they provide Long Term Support b. That support is for the "Main" repository only. Neither of these points is incorrect: though "claim" clearly implies their opinion. All the Linux distributions need to draw the line somewhere on what software they will provide security for: Ubuntu comes from the Debian tradition which packages a large swathe of software, so to differentiate levels of support/origin they are separated into repositories. Other distributions reduce the total amount of packaged software made available, to deal with the same issue. The title is misleading because it implies that Ubuntu LTS' security record is poor: which this article is not discussing.