Problem installing Arduino IDE 1.8.19 and Teensyduino 1.59 on RPI5 Bookworm

I'm running Arduino IDE 1.8.19 and Teensyduino 1.59.0 on a clean install RPI5 Bookworm running on an m.2 nVME hosted on PCIExpress bus.

After a number of false starts, I've loaded Arduino IDE and Teensyduino using a script from Paul Stoffregen Aug 24, 2020 with minor changes to reflect latest release versions, which goes
sudo cp 49-teensy.rules /etc/udev/rules.d/
tar -xf arduino-1.8.19-linuxaarch64.tar.xz
chmod 755 TeensyduinoInstall.linuxaarch64
./TeensyduinoInstall.linuxaarch64 --dir=arduino-1.8.19
cd arduino-1.8.19

If I go into the arduino-1.8.19 direcotry and click on 'Arduino', it runs, finds boards including Teensy4.1 and I can successfully compile.

I have two problems;
1. The Arduino application doesn't appear in the desktop menu, either under Programming or Electronics. How do I make this happen?
2. Teensyduino is started when the Arduino IDE tries to upload code to the T4.1, but uploading never starts, whether I press the programming button or not.
- Arduino IDE finds port /dev/bus/usb/003/009 Bootloader (Teensy 4.1)
- Arduino IDE times out with the message,
Teensy did not respond to a USB-based request to enter program mode.
An error occurred while uploading the sketch
Please press the PROGRAM MODE BUTTON on your Teensy to upload your sketch.

Can anyone help me, please?