大部分文章都是

$ cat /proc/cpuinfo
$ cat /proc/meminfo

但是对于arm系统非常不友好，看不到什么信息。用下面的新命令吧.

$ lscpu
$ lsmem

安装

$ sudo apt install mysql-server

查看默认账号密码

$ sudo cat /etc/mysql/debian.cnf
# Automatically generated for Debian scripts. DO NOT TOUCH!
[client]
host     = localhost
user     = debian-sys-maint
password = JRvfA0JiQGk5qhnz
socket   = /var/run/mysqld/mysqld.sock
[mysql_upgrade]
host     = localhost
user     = debian-sys-maint
password = JRvfA0JiQGk5qhnz
socket   = /var/run/mysqld/mysqld.sock

修改密码

$ mysql -udebian-sys-maint -pJRvfA0JiQGk5qhnz

mysql>USE mysql;

// mysql 5.7
mysql>UPDATE user SET plugin='mysql_native_password' WHERE User='root';
mysql>update mysql.user set authentication_string=password('xxx') where User='root' and Host='localhost';
// mysql 8.0
mysql>ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'xxx';

mysql>flush privileges;
mysql>exit;

下载

golang官网已可以从中国访问，地址:The Go Programming Language
下载对应平台的bin包(源码编译需要golang1.4以上),并解压。

$ wget https://golang.google.cn/dl/go1.18.linux-arm64.tar.gz
$ tar zxvf go1.18.linux-arm64.tar.gz

阅读剩余部分

需要手动添加dns服务器才能解析网址：
修改/etc/netplan/00-installer-config.yaml内容如下，注意enp0s3需要修改

# This is the network config written by 'subiquity'
network:
  ethernets:
    enp0s3:
      addresses: []
      dhcp4: true
      gateway4: 192.168.0.1
      nameservers:
          addresses: [223.5.5.5, 223.6.6.6]
  version: 2

重启网络
sudo netplan apply

官方文档 推荐使用docker自己的apt源，不使用Ubuntu自带的docker源。

Uninstall old docker versions

$ for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done

阅读剩余部分

Qemu在Linux安装新系统一次成功，在window下卡启动报告～

安装 qemu

apt-get instll qemu qemu-utils qemu-system-x86

新建虚拟机，安装系统

qemu-img create -f qcow2 ubunut18_x86_64.img 10G
qemu-img info ubunut18_x86_64.img
qemu-system-x86_64 --enable-kvm -m 1G -smp 2 -boot order=dc -hda /home/u0u0/works/qemu-images/ubuntu18.img -cdrom /home/u0u0/ubuntu-18.04.5-live-server-amd64.iso

阅读剩余部分

安装gcc7和g++7

sudo apt install gcc-7 g++-7

添加配置

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 90 --slave /usr/bin/g++ g++ /usr/bin/g++-9 --slave /usr/bin/gcov gcov /usr/bin/gcov-9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 70 --slave /usr/bin/g++ g++ /usr/bin/g++-7 --slave /usr/bin/gcov gcov /usr/bin/gcov-7

切换gcc版本

sudo update-alternatives --config gcc

错误信息:

Failed to Set MokListRT: Invalid Parameter
Could not create mokListRT: Invalid Parameter
Importing MOK states has failed: import_mok_state() failed: Invalid Parameter
Continuing boot since secure mode is disabled.

修正:

sudo su -
cd /boot/efi/EFI/ubuntu
cp grubx64.efi shimx64.efi
reboot

参考：(Ubuntu 20.04 Failed to Set MokListRT: Invalid Parameter)[https://askubuntu.com/questions/1279602/ubuntu-20-04-failed-to-set-moklistrt-invalid-parameter]

1. netplan 自身配置文件/etc/netplan/50-cloud-init.yaml

network:
    version: 2
    renderer: networkd
    ethernets:
        ens3:
            addresses:
            - 154.204.42.134/24
            gateway4: 154.204.42.254
            match:
                macaddress: fa:16:3e:b9:65:3b
            nameservers:
                addresses:
                - 8.8.8.8
                - 8.8.4.4
            set-name: ens3

应用修改

sudo netplan apply

阅读剩余部分

http://git-cola.github.io/downloads.html

跨平台免费软件。