前言

Qt6.22LTS版本正式推出了，刚好有个项目，使用的linux屏资源比较好，准备使用Qt6.22，记录下在ubuntu20.04.3下安装Qt6.22的步骤

一、安装步骤

1.安装ubuntu20.04.3

直接到ubuntu网站，下载该安装镜像，在虚拟机下安装即可

2.更新ubuntu镜像下载源

2.1 修改 sources.list文件

不要使用ubuntu桌面的设置来设置为国内下载源，直接修改/etc/apt/sources.list文件
使用 sudo gedit /etc/apt/sources.list打开该文件
删除文件内所有内容后，使用阿里云镜像

# 阿里云镜像
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse

2.2 更新操作

在终端内运行

sudo apt update
sudo apt upgrade

若执行 sudo apt upgrade 提示以下错误，是因为某个进程锁住了文件，我是直接重启后再upgrade，或参考其他方法，杀死进程，删除导致锁定的文件

Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend xxxx

3.替换系统的vim

ubuntu自带的vim是tiny版，经常会有奇怪的字符，替换系统自带的vim

sudo apt remove vim-common
sudo apt install vim

4.安装gcc编译器

sudo apt-get install build-essential
sudo apt-get install libgl1-mesa-dev

安装完毕后，控制台输入gcc -v查看版本号，我的是9.4

root@ubuntu:/opt# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.4.0-1ubuntu1~20.04' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-9-yTrUTS/gcc-9-9.4.0/debian/tmp-nvptx/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04)