Darren Hoo darren

Ubuntu 20.04 with Wifi on iMac 2019 (MacOS 11 - Big Sur)

The purpose of this document is to summarize some of the things I had to figure out to successfully install Ubuntu on my iMac '19 27" 5K, a.k.a. iMac 19,1.

t2linux

From what I could find, iMac's do not have the t2 security chip. However, it does share hardware (and firmware) with contemporary Macbook Pros. For this reason, the t2linux.org website contains lots of helpful information about how to install Ubuntu on an iMac.

However, the guides on the t2linux website did not work for me when I ran it, so I had to mix and match some old pages from the wiki to make things work. Also, most issues are focused on Macbooks, not iMacs.

In order to compile a fully static binary when using Cgo you'll need to link in a C library like musl.

I find it convenient to have a Docker image ready for building these artifacts.

FROM golang
RUN wget https://musl.libc.org/releases/musl-1.2.5.tar.gz && \
   tar -xzf musl-1.2.5.tar.gz && \
   cd musl-1.2.5 && \
 ./configure --enable-static --disable-shared &amp;&amp; \

1:设置

sudo vi /etc/sysctl.conf
net.ipv4.ip_forward=1
sudo sysctl -p

2:安装

https://www.wireguard.com/install/

	package main

	import (
	"flag"
	"io"
	"log"
	"net"
	"net/http"
	"os"
	"strings"

	sudo apt-get purge bcmwl-kernel-source
	sudo apt update
	sudo update-pciids
	sudo apt install firmware-b43-installer
	sudo reboot #note that this will restart your computer
	sudo iwconfig wlp3s0 txpower 10dBm
	#sudo iwconfig wlp2s0 txpower 10dBm

	package main

	import (
	"encoding/binary"
	"errors"
	"fmt"
	"io"
	"net"
	)

	const utils = {
	colors: {
	red: function(string) {
	return '\x1b[31m' + string + '\x1b[0m';
	},

	green: function(string) {
	return '\x1b[32m' + string + '\x1b[0m';
	},

	# single subtitle with MP4(for MOV : change mov_text to srt)
	$ ffmpeg -i VIDEO.mp4 -i SUBTITLE.srt -c:v copy -c:a copy -c:s mov_text OUTPUT.mp4
	$ ffmpeg -i VIDEO.mov -i SUBTITLE.srt -c:v copy -c:a copy -c:s srt OUTPUT.mov

	# multiple subtitles with MP4(for MOV : change mov_text to srt)
	$ ffmpeg -i VIDEO.mp4 -i KOREAN.srt -i ENGLISH.srt \
	-c:v copy -c:a copy -c:s mov_text \
	-map 0:v -map 0:a -map 1 -map 2 \
	-metadata:s:s:0 language=kor -metadata:s:s:1 language=eng \
	OUTPUT.mp4

	httpsServer := &http.Server{
	Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	hj, isHJ := w.(http.Hijacker)
	if r.Header.Get("Upgrade") == "websocket" && isHJ {
	c, br, err := hj.Hijack()
	if err != nil {
	log.Printf("websocket websocket hijack: %v", err)
	http.Error(w, err.Error(), 500)
	return
	}

	// You may want to first disable transparent huge pages:
	//
	// echo never \| sudo tee /sys/kernel/mm/transparent_hugepage/enabled

	package main

	import (
	"flag"
	"fmt"
	"io/ioutil"