1. install oem ISO on Dell OptiPlex 7400
2. Enable Proposed channel (Pre-released updates (focal-proposed))
3. $sudo apt update
4. $sudo apt upgrade
5. Reboot system to make updates take effect
6. Four corners of the touch screen are sensitive, touch response speed is prompt
Tested by ODM.
1. install oem ISO on Dell OptiPlex 7400
2. Enable Proposed channel (Pre-released updates (focal-proposed))
3. $sudo apt update
4. $sudo apt upgrade
5. Reboot system to make updates take effect
6. Four corners of the touch screen are sensitive, touch response speed is prompt