安装新软件时候一直遇到这个问题：
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
python-dev : Depends: libpython-dev (= 2.7.12-1~16.04) but it is not going to be installed
Depends: python2.7-dev (>= 2.7.12-1~) but it is not going to be installed
ubuntu-core-launcher : Depends: snapd (= 2.34.2) but 2.34.2~14.04 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution)
觉得应该是源的问题运行apt-get update命令，发现以下错误：
W: GPG error: https://download.sublimetext.com apt/stable/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F57D4F59BD3DF454
W: The repository 'https://download.sublimetext.com apt/stable/ InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
这个说明是公钥缺失，安装公钥
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F57D4F59BD3DF454
之后再次运行update命令，运行成功，但是再apt-get upgrade命令中出现新的错误：
ubuntu-core-launcher : Depends: snapd (= 2.34.2) but 2.34.2~14.04 is installed
E: Unmet dependencies. Try using -f.
按照bing得到的结果，移除Ubuntu-core-launcher，再次运行运行成功
之后使用apt-get安装软件的时候出现snapd的错误，snapd是一个包安装管理器，但是作为一个apt-get党，觉得这个删就删吧，运行命令：
apt-get remove snapd
发现不能删除，是因为var/lib/dpkg/info/snapd.prerm的存在，于是再其第二行加入exit 0骗过shell脚本，执行remove命令。
最后利用update和upgrade命令进行更新源，完成！！！
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