1、替换安装库（在国内用起来更为方便快捷）
清华或阿里的都可以
Ubuntu 19.04 国内更新源：https://blog.csdn.net/wy_bk/article/details/89473921
sources.list（存放在你能找得到的位置，推荐放在desktop目录下）
gedit sources.list # 在相应的位置创建文本
# 以下是阿里19.04的库 deb http://mirrors.aliyun.com/ubuntu/ disco main restricted universe multiverse # deb-src http://mirrors.aliyun.com/ubuntu/ disco main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ disco-security main restricted universe multiverse # deb-src http://mirrors.aliyun.com/ubuntu/ disco-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ disco-updates main restricted universe multiverse # deb-src http://mirrors.aliyun.com/ubuntu/ disco-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ disco-backports main restricted universe multiverse # deb-src http://mirrors.aliyun.com/ubuntu/ disco-backports main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ disco-proposed main restricted universe multiverse # deb-src http://mirrors.aliyun.com/ubuntu/ disco-proposed main restricted universe multiverse
# 18.04清华源 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
替换原库
sudo -s # 先获取管理员权限才能替换系统文件
cp sources.list /etc/apt/ # cp:copy的意思 （替换时保证命令在文件所在路径，如：～/Desktop# cp sources.list /etc/apt/, #前为当前路径）
替换完成后则需要进行更新
apt-get update
2、安装gtk-3
apt-get install libgtk-3-dev
3、安装gobject-introspection
apt-get install python3-gi
其他linux小知识：
1 赋予管理员权限
sudo -s
2 查找自己所需的文件（可通过文件信息查找）
apt-cache search python gobject
3 按tab键可自动补齐命令
4 可以通过输入部分命令（关键字），来查找自己所需要的命令