ubuntu18.04.1下无法安装libgstreamer1.

最近在使用pyqt5编写多媒体播放程序, 发现ubuntu18.04.1下竟然无法使用下面的命令安装libgstreamer1.0-dev.

sudo apt install libgstreamer1.0-dev

提示依赖库: libglib2.0-dev不满足要求. 网上查了资料,没有发现大家说无法安装啊?! 下载deb包安装依旧不行.
怀疑当前使用的source.list依赖配置有问题, 改成ali的源, 执行:

sudo apt update  && sudo apt upgrade

提示部分升级...? 查看source.list文件:

sudo vim /etc/apt/source.list 

发现所有 src源不知什么时候被自己注释掉了.

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
#deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse

去掉注释, 重新更新并执行安装代码:

sudo apt update && sudo apt upgrade && sudo apt install libgstreamer1.0-dev

OK, 顺利完成安装.

结论: deb-src 源对系统的依赖完整性和稳定性还是很重要的, 不可注释掉 !!!