基于ROCKCHIP的ubuntu-base根文件系统构建

1、ubuntu根文件系统获取

根文件系统下载地址http://cdimage.ubuntu.com/ubuntu-base/releases/
Ubuntu 针对不同的 CPU 架构提供相应的 ubuntu base 根文件系统，有 amd64(64 位 X86)、 armhf、 i386(32 位 X86)、 powerpc、 ppc64el 等系统的。

首先根据ubuntu系统的版本号确认版本，再根据ROCKCHIP选择ARM版本的文件系统。

1：cd /home/xxx/mkdir ubuntu_rootfs
2：cp  ubuntu-base-18.04.5-base-arm64.tar.gz  /home/xxx/ubuntu_rootfs
3：sudo tar -vzxf ubuntu-base-18.04.5-base-arm64.tar.gz

2、准备arm环境

安装qemu工具

sudo apt-get install qemu-user-static

将安装生成的qemu-user-static 拷贝到刚刚解压出来的 ubuntu base 目录中：

cp /usr/bin/qemu-aarch64-static usr/bin

设置ubuntu base的网络

cp -b /etc/resolv.conf /home/xxx/ubuntu_rootfs/etc/

3、给ubuntu文件系统安装软件

修改软件源，建议使用国内的源，安装软件速度快。
进入/etc/apt/：cd /etc/apt
修改sources.list文件中的ubutnu官方软件源，修改为国内网易云的源，修改后如下所示：

#deb cdrom:[Ubuntu 18.04.5 LTS _Bionic Beaver_ - Release amd64 (20200806.1)]/ bionic main restricted# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://mirrors.163.com/ubuntu/ bionic main restricted
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic main restricted## Major bug fix updates produced after the final release of the
## distribution.
deb http://mirrors.163.com/ubuntu/ bionic-updates main restricted
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic-updates main restricted## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://mirrors.163.com/ubuntu/ bionic universe
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic universe
deb http://mirrors.163.com/ubuntu/ bionic-updates universe
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic-updates universe## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://mirrors.163.com/ubuntu/ bionic multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic multiverse
deb http://mirrors.163.com/ubuntu/ bionic-updates multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic-updates multiverse## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://mirrors.163.com/ubuntu/ bionic-backports main restricted universe multiverse
# deb-src http://cn.archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu bionic partner
# deb-src http://archive.canonical.com/ubuntu bionic partnerdeb http://mirrors.163.com/ubuntu bionic-security main restricted
# deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted
deb http://mirrors.163.com/ubuntu bionic-security universe
# deb-src http://security.ubuntu.com/ubuntu bionic-security universe
deb http://mirrors.163.com/ubuntu bionic-security multiverse
# deb-src http://security.ubuntu.com/ubuntu bionic-security multiverse

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基于ROCKCHIP的ubuntu-base根文件系统构建

1、ubuntu根文件系统获取

2、准备arm环境

3、给ubuntu文件系统安装软件

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