In the html documentation for 2.9, specifically page:
linuxcnc.org/docs/stable/html/getting-st...dating-linuxcnc.html
I believe an update is needed. I am not sure how to suggest an update, and wanted to ensure what I found was indeed a problem.
In the 1.1 Apt Sources Configuration, there is a Table 1, that shows the Repository information for the various Debian versions and kernel type.
It appears the Repository information for the Debian Buster - preempt, has the wrong information.
I was attempting to update from 2.8 to 2.9 and hit a snag on the step where you add the new repository to the synaptic package manager. It kept saying it was not found/good info.
I then stumbled across this page:
linuxcnc.org/dists/buster/ and found that for 2.9 there is not a rtpreempt folder but rather a uspace folder. So it appears between 2.8 and 2.9 the folder for buster has changed.
I updated my repository information to replace what was in the chart, changing the "base 2.9-rtpreempt" to "2.9-uspace base" and then the synaptic package manager found the repository and I was able to update to 2.9.
