docker networking not working after installing Docker Desktop in Ubuntu - linux

Question

after I installed Docker Desktop on my linux machine, my docker containers don't work any more. The containers can't communicate with each others or connect to the internet.
I found the Self-diagnose tool. And when running this I get:
➜ ~ /opt/docker-desktop/bin/com.docker.diagnose check
[2022-10-21T21:53:23.963576537Z][com.docker.diagnose][I] set path configuration to OnHost
Starting diagnostics
[PASS] DD0018: does the host support virtualization?
[PASS] DD0001: is the application running?
[PASS] DD0017: can a VM be started?
[PASS] DD0016: is the LinuxKit VM running?
[PASS] DD0011: are the LinuxKit services running?
[PASS] DD0004: is the Docker engine running?
[PASS] DD0015: are the binary symlinks installed?
[PASS] DD0031: does the Docker API work?
[PASS] DD0013: is the $PATH ok?
[PASS] DD0034: is Context set to a Docker Desktop context?
[PASS] DD0003: is the Docker CLI working?
[FAIL] DD0014: are the backend processes running? 2 errors occurred:
* querying com.docker.backend process: is it running as a different user?: readlink /proc/22636/exe: permission denied
* querying com.docker.backend process: is it running as a different user?: readlink /proc/22654/exe: permission denied
[PASS] DD0007: is the backend responding?
[PASS] DD0008: is the native API responding?
[PASS] DD0009: is the vpnkit API responding?
[PASS] DD0010: is the Docker API proxy responding?
[FAIL] DD0012: is the VM networking working? network checks failed: failed to ping host: exit status 1
[2022-10-21T21:53:24.648095036Z][com.docker.diagnose][I] ipc.NewClient: 4c9ff8fa-diagnose-network -> diagnosticd.sock diagnosticsd
[common/pkg/diagkit/gather/diagnose.runIsVMNetworkingOK()
[ common/pkg/diagkit/gather/diagnose/network.go:34 +0xd9
[common/pkg/diagkit/gather/diagnose.(*test).GetResult(0x11754a0)
[ common/pkg/diagkit/gather/diagnose/test.go:46 +0x43
[common/pkg/diagkit/gather/diagnose.Run.func1(0x11754a0)
[ common/pkg/diagkit/gather/diagnose/run.go:17 +0x5a
[common/pkg/diagkit/gather/diagnose.walkOnce.func1(0x2?, 0x11754a0)
[ common/pkg/diagkit/gather/diagnose/run.go:142 +0x77
[common/pkg/diagkit/gather/diagnose.walkDepthFirst(0x1, 0x11754a0, 0xc000223728)
[ common/pkg/diagkit/gather/diagnose/run.go:151 +0x87
[common/pkg/diagkit/gather/diagnose.walkDepthFirst(0x0, 0x11755a0, 0xc000223728)
[ common/pkg/diagkit/gather/diagnose/run.go:148 +0x52
[common/pkg/diagkit/gather/diagnose.walkOnce(0xb0fde0?, 0xc00035f890)
[ common/pkg/diagkit/gather/diagnose/run.go:137 +0xcc
[common/pkg/diagkit/gather/diagnose.Run(0x11755a0, 0x7fbd50ef6300?, {0xc00035fb20, 0x1, 0x1})
[ common/pkg/diagkit/gather/diagnose/run.go:16 +0x1d4
[main.checkCmd({0xc00012e010?, 0x6?, 0x4?}, {0x0, 0x0})
[ common/cmd/com.docker.diagnose/main.go:133 +0x105
[main.main()
[ common/cmd/com.docker.diagnose/main.go:99 +0x2a7
[2022-10-21T21:53:24.648917178Z][com.docker.diagnose][I] (c88fef01) 4c9ff8fa-diagnose-network C->S diagnosticsd POST /check-network-connectivity: {"ips":["169.254.5.211","169.254.5.199","192.168.86.22"]}
[2022-10-21T21:53:25.180233483Z][com.docker.diagnose][W] (c88fef01) 4c9ff8fa-diagnose-network C<-S d6792b26-diagnosticsd POST /check-network-connectivity (531.701612ms): failed to ping host: exit status 1
[SKIP] DD0030: is the image access management authorized?
[PASS] DD0037: is the virtiofs setup correct?
[PASS] DD0036: is the credentials store configured correctly?
[PASS] DD0033: does the host have Internet access?
[PASS] DD0018: does the host support virtualization?
[PASS] DD0001: is the application running?
[PASS] DD0017: can a VM be started?
[PASS] DD0016: is the LinuxKit VM running?
[PASS] DD0011: are the LinuxKit services running?
[PASS] DD0004: is the Docker engine running?
[PASS] DD0015: are the binary symlinks installed?
[PASS] DD0031: does the Docker API work?
[PASS] DD0032: do Docker networks overlap with host IPs?
Please investigate the following 2 issues:
1 : The test: are the backend processes running?
Failed with: 2 errors occurred:
* querying com.docker.backend process: is it running as a different user?: readlink /proc/22636/exe: permission denied
* querying com.docker.backend process: is it running as a different user?: readlink /proc/22654/exe: permission denied
Not all of the backend processes are running.
2 : The test: is the VM networking working?
Failed with: network checks failed: failed to ping host: exit status 1
VM seems to have a network connectivity issue. Check your host firewall and anti-virus settings in case they are blocking the VM.
Docker version:
➜ ~ docker version
Client: Docker Engine - Community
Cloud integration: v1.0.29
Version: 20.10.20
API version: 1.41
Go version: go1.18.7
Git commit: 9fdeb9c
Built: Tue Oct 18 18:20:18 2022
OS/Arch: linux/amd64
Context: desktop-linux
Experimental: true
Server: Docker Desktop 4.13.0 (89412)
Engine:
Version: 20.10.20
API version: 1.41 (minimum version 1.12)
Go version: go1.18.7
Git commit: 03df974
Built: Tue Oct 18 18:18:35 2022
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.8
GitCommit: 9cd3357b7fd7218e4aec3eae239db1f68a5a6ec6
runc:
Version: 1.1.4
GitCommit: v1.1.4-0-g5fd4c4d
docker-init:
Version: 0.19.0
GitCommit: de40ad0
The issues are right there, but I have no clue on how to fix this.