Force update when PPA repository doesn't have release file [duplicate]
Solution 1:
SysMonTask Installation
start the terminal and then
wget https://github.com/KrispyCamel4u/SysMonTask/releases/download/v1.3.9/sysmontask_1.3.9-ubuntu20.10_all.deb
or
wget https://launchpad.net/~camel-neeraj/+archive/ubuntu/sysmontask/+files/sysmontask_1.3.9-ubuntu20.10-a_all.deb
sudo apt install ./sysmontask_1.3.9-ubuntu20.10_all.deb
or sudo apt install ./sysmontask_1.3.9-ubuntu20.10-a_all.deb