Installing from should work, doesn't Nothing else does.

Failed to install  - file not supported

$ cat /etc/os-release NAME="Ubuntu" VERSION="20.04.2 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.2 LTS" VERSION_ID="20.04" HOME_URL="" SUPPORT_URL="" BUG_REPORT_URL="" PRIVACY_POLICY_URL="" VERSION_CODENAME=focal UBUNTU_CODENAME=focal ubuntu@ubuntu:~$ dpkg --print-architecture amd64
3

2 Answers

Use sudo apt-get install synaptic

Adding the respository fixed it.

sudo apt-add-repository universe

then

sudo apt-get install synaptic

worked

Remember there is a synaptics trackpad and a synaptic package manager.