Tailscale on Pi - "failed to connect to local tailscaled" Help Please

Hey,

Running

PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
VERSION_CODENAME=stretch
ID=raspbian
ID_LIKE=debian

pi@RevPi38769:~ $ tailscale version
1.56.1
  tailscale commit: 906f85d10c0b7b653116db19913ebeab85ee01ec
  other commit: 34ed54c8c566d51e6500114624c57ba55b2a34ea
  go version: go1.21.5

I was prompted by tailscale dashboard to update - I have ran into a bit of trouble after doing the upgrade and need some help ( Have googled this)

I ended up doing

sudo apt-get remove tailscale

Then running

curl -fsSL https://tailscale.com/install.sh | sh

Then when I run

pi@RevPi38769:~ $ sudo tailscale up
failed to connect to local tailscaled (which appears to be running as tailscaled, pid 17713). Got error: 503 Service Unavailable: no backend

It seems like its failing to start or something:

Pease bear with me as I only know enough to be dangerous

pi@RevPi38769:~ $ sudo systemctl status tailscaled
● tailscaled.service - Tailscale node agent
   Loaded: loaded (/lib/systemd/system/tailscaled.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2024-01-12 17:35:07 AEDT; 587ms ago
     Docs: https://tailscale.com/kb/
  Process: 17731 ExecStopPost=/usr/sbin/tailscaled --cleanup (code=exited, status=0/SUCCESS)
  Process: 17790 ExecStartPre=/usr/sbin/tailscaled --cleanup (code=exited, status=0/SUCCESS)
 Main PID: 17840 (tailscaled)
    Tasks: 10 (limit: 4915)
   CGroup: /system.slice/tailscaled.service
           └─17840 /usr/sbin/tailscaled --state=/var/lib/tailscale/tailscaled.state --socket=/run/tailscale/tailscaled.sock --port=41641

Jan 12 17:35:07 RevPi38769 tailscaled[17840]: logpolicy: using system state directory "/var/lib/tailscale"
Jan 12 17:35:07 RevPi38769 tailscaled[17840]: wgengine.NewUserspaceEngine(tun "tailscale0") ...
Jan 12 17:35:07 RevPi38769 tailscaled[17840]: Linux kernel version: 6.1.72-v7+
Jan 12 17:35:07 RevPi38769 systemd[1]: Started Tailscale node agent.
Jan 12 17:35:07 RevPi38769 tailscaled[17840]: is CONFIG_TUN enabled in your kernel? `modprobe tun` failed with: modprobe: FATAL: Module tun not found in directory /lib/modules/6.1.72-v7+
Jan 12 17:35:08 RevPi38769 tailscaled[17840]: kernel/drivers/net/tun.ko found on disk, but not for current kernel; are you in middle of a system update and haven't rebooted? found: raspberrypi-kernel: /lib/modules/4.19.95-rt38-v7/kernel/d
Jan 12 17:35:08 RevPi38769 tailscaled[17840]: raspberrypi-kernel: /lib/modules/4.19.95-rt38/kernel/drivers/net/tun.ko
Jan 12 17:35:08 RevPi38769 tailscaled[17840]: wgengine.NewUserspaceEngine(tun "tailscale0") error: tstun.New("tailscale0"): no such device
Jan 12 17:35:08 RevPi38769 tailscaled[17840]: flushing log.
Jan 12 17:35:08 RevPi38769 tailscaled[17840]: logger closing down

How do I fix this issue?