Ubuntu 20, Sloeber 4.3.3

Hi
Using Sloeber fine but Win10 pissed me off again, so I

  • cleaned disk
    and installed
  • single boot Ubuntu 20
  • KiCad
  • Sloeber 4.3.3 product

Sloeber had Platform and Board PATH issues so google led me to uninstalled and then installed arduino 1.8.13 and then re-installed Sloeber.
Arduino and KiCad test fine.
Sloeber better, but Verify of Blinky, gives...

10:55:43 **** Incremental Build of configuration Release for project test ****
make all 
Cannot run program "make": Unknown reason

Error: Program "make" not found in PATH
PATH=[/bin/::/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin]

Project>Properties>C++ Build shows External Builder and ${JANTJE.MAKE_LOCATION}make
But there is no variable JANTJE.MAKE_LOCATION ?!?

As a Linux newbie, I'm stuck.. help please.