Tasker Permissions was successfully (without any reported errors nor warnings) installed under Ubuntu 18.04.6 LTS.
However after opening Tasker Permissions an error is reported as per the attached DialogWindow-shot.
The following actions were tried and did produce the same error:
1. from website click on link https://github.com/joaomgcd/Tasker-Permissions/releases/download/v0.1.0/com.joaomgcd.taskerpermissions_0.1.0_amd64.deb and allow Ubuntu's Software-Installer to proceed.
2. from same website as in 1. "save as" from link https://github.com/joaomgcd/Tasker-Permissions/releases/download/v0.1.0/com.joaomgcd.taskerpermissions_0.1.0_amd64.deb and in a Terminal issue the command <sudo dpkg -i Dowloads/com.joaomgcd.taskerpermissions_0.1.0_amd64.deb>
System info: Ubuntu 18.04.6 LTS, OS type 64-bit, proc AMD® Athlon(tm) ii x4 640 processor × 4, Graphics AMD Rs880, Gnome 3.28.2
Kernal info: