sudo: add-apt-repository: command not found
问题：安装jdk1.8，会出现如下报错：add-apt-repository: command not found
nm_svr01@ubuntu:~/MT8788_9.0/mt8788_v5.196$ sudo add-apt-repository ppa:openjdk-r/ppa
sudo: add-apt-repository: command not found解决方法：
add-apt-repository 命令是software-properties-common包的一部分，因此安装这个包就OK了
sudo apt-get install software-properties-common
sudo apt-get update
解决完成：
nm_svr01@ubuntu:~/MT8788_9.0/mt8788_v5.196$ sudo add-apt-repository ppa:openjdk-r/ppa
More info: https://launchpad.net/~openjdk-r/+archive/ubuntu/ppa
Press to continue or ctrl-c to cancel adding it
gpg: keyring `/tmp/tmp7im1j0fx/secring.gpg' created
gpg: keyring `/tmp/tmp7im1j0fx/pubring.gpg' created
gpg: requesting key 86F44E2A from hkp server keyserver.ubuntu.com
gpg: /tmp/tmp7im1j0fx/trustdb.gpg: trustdb created
gpg: key 86F44E2A: public key "Launchpad OpenJDK builds (all archs)" imported
gpg: Total number processed: 1
gpg: imported: 1(RSA: 1)
OK
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