kubectl get nodes: "the server is currently unable to handle the request"

After cloning and installing team-container "kubectl get nodes" shows the above error.

`the server is currently unable to handle the request`

k3s-serve seems to be listening on the specified port:

`lsof -i -n`

`k3s-serve 3165 root 5u IPv6 1291421350 0t0 TCP *:6443 (LISTEN)`
`k3s-serve 3165 root 12u IPv4 1291415104 0t0 TCP 127.0.0.1:sge-qmaster (LISTEN)`
`k3s-serve 3165 root 152u IPv4 1291371447 0t0 TCP 127.0.0.1:47276->127.0.0.1:sge-qmaster (ESTABLISHED)`
`k3s-serve 3165 root 153u IPv4 1291397987 0t0 TCP 127.0.0.1:sge-qmaster->127.0.0.1:47276 (ESTABLISHED)`
`k3s-serve 3165 root 155u IPv4 1291397990 0t0 TCP 127.0.0.1:47352->127.0.0.1:sge-qmaster (ESTABLISHED)`
`k3s-serve 3165 root 179u IPv4 1291437064 0t0 TCP 127.0.0.1:sge-qmaster->127.0.0.1:47352 (ESTABLISHED)`

The syslog tells me that some modules seem to be missing:

'Apr 17 16:12:43 localhost modprobe[5178]: modprobe: ERROR: ../libkmod/libkmod.c:514 lookup_builtin_file() could not open builtin file '/lib/modules/4.9.0/modules.builtin.bin'
Apr 17 16:12:43 localhost modprobe[5178]: modprobe: FATAL: Module br_netfilter not found in directory /lib/modules/4.9.0
Apr 17 16:12:43 localhost modprobe[5179]: modprobe: ERROR: ../libkmod/libkmod.c:514 lookup_builtin_file() could not open builtin file '/lib/modules/4.9.0/modules.builtin.bin'

Have you seen this before? I'm trying to get things working on an 1blu V-server with Debian 9.8

Start by reproducing `kubectl get nodes` on the described Debian 9.8 environment and inspect the `k3s-serve` and syslog output. Check the reported `br_netfilter` module and the `lsof` listener details; the issue is done when the cause is identified and a verified fix or supported-environment explanation is documented.

Written by the indexing model from the issue text.