Problem Updating from 2.6 to 2.9

Hello guys, I have a lathe with linuxcnc 2.6 wich I need to upgrade to 2.9
Updating  from 2.6 to 2.7 worked fine by following the instructions from the manual.
Updating 2.7 to 2.8 :  I used  the script which converts configuration files automatically , when launching for the first time suddendly I get an error log (attached please zoom the image).At this point I coudn`t figure out the cause.I wonder if you guys would be willing to help me with this issue.

Edit the custom_postgui.hal with a text editor (not office stuff), omit or delete the line 7 that contains
motion.spindle-brake
ONLY if you are not actually using a spindle brake.

Linuxcnc 2.8.4 works very well so far, I'm going to update to 2.9, I'll use the method wich consist of downloading the latest deb file (from buildbot) and installing it with dpkg. My question is ig this is a good way to go, or could anyone suggest me another  one. thank you

Use gdebi to install debs, it is a GUI package manager and is a bit safer than dpkg
sudo apt install gdebi
after installing this, just double clicking on a deb file from the file explorer with open it, no need for terminal.

I´ve a question, is it possible to roll back to previous version by installing older deb the same way Updates are installed?

To some extent, yes.
To be safe, save the new or working debs, then
sudo apt purge linuxcnc-uspace
then try installing the deb you want.

When trying to install lastest deb (2.9) I got some errors and it couldn't be updated (2.8.4 ==> 2.9). I couldn't install gdebi either so  I used dpkg.

I made a new clean install but errors persist.

I couldn't figure out how to solve this. Need help


 

sudo apt update
sudo apt install gdebi
then
uname -a
lsb_release -a

tommylight wrote:

sudo apt update
sudo apt install gdebi
then
uname -a
lsb_release -a


this is what i get 

 

Something wrong with your repository file, what is the error from
sudo apt update
?