我正在与Vagrant建立开发环境。我安装了ubuntu / trust64，一切正常。
我用apt-get完成了mysql的安装。默认情况下，管理器安装了5.5版。我想将mysql更新到8.0版。
因此，我按照本教程将mysql升级到8.0版：https://www.tecmint.com/install-mysql-8-in-ubuntu/
我遵循以下命令：
wget -c https://dev.mysql.com/get/mysql-apt-config_0.8.10-1_all.deb sudo dpkg -i mysql-apt-config_0.8.10-1_all.deb I selected mysql 8.0 to install sudo apt update sudo apt-get install mysql-server
很遗憾，没有任何反应。总站向我显示此消息：
Hit http://archive.ubuntu.com trusty-updates/multiverse amd64 Packages
Hit http://archive.ubuntu.com trusty-updates/main Translation-en
Hit http://archive.ubuntu.com trusty-updates/multiverse Translation-en
Hit http://archive.ubuntu.com trusty-updates/restricted Translation-en
Hit http://archive.ubuntu.com trusty-updates/universe Translation-en
Hit http://archive.ubuntu.com trusty-backports/main Sources
Hit http://archive.ubuntu.com trusty-backports/restricted Sources
Hit http://archive.ubuntu.com trusty-backports/universe Sources
Hit http://archive.ubuntu.com trusty-backports/multiverse Sources
Hit http://archive.ubuntu.com trusty-backports/main amd64 Packages
Hit http://archive.ubuntu.com trusty-backports/restricted amd64 Packages
Hit http://archive.ubuntu.com trusty-backports/universe amd64 Packages
Hit http://archive.ubuntu.com trusty-backports/multiverse amd64 Packages
Hit http://archive.ubuntu.com trusty-backports/main Translation-en
Hit http://archive.ubuntu.com trusty-backports/multiverse Translation-en
Hit http://archive.ubuntu.com trusty-backports/restricted Translation-en
Hit http://archive.ubuntu.com trusty-backports/universe Translation-en
Hit http://archive.ubuntu.com trusty Release
Hit http://archive.ubuntu.com trusty/main Sources
Hit http://archive.ubuntu.com trusty/restricted Sources
Hit http://archive.ubuntu.com trusty/universe Sources
Hit http://archive.ubuntu.com trusty/multiverse Sources
Hit http://archive.ubuntu.com trusty/main amd64 Packages
Hit http://archive.ubuntu.com trusty/restricted amd64 Packages
Hit http://archive.ubuntu.com trusty/universe amd64 Packages
Hit http://archive.ubuntu.com trusty/multiverse amd64 Packages
Hit http://archive.ubuntu.com trusty/main Translation-en
Hit http://archive.ubuntu.com trusty/multiverse Translation-en
Hit http://archive.ubuntu.com trusty/restricted Translation-en
Hit http://archive.ubuntu.com trusty/universe Translation-en
Ign http://archive.ubuntu.com trusty/main Translation-en_US
Ign http://archive.ubuntu.com trusty/multiverse Translation-en_US
Ign http://archive.ubuntu.com trusty/restricted Translation-en_US
Ign http://archive.ubuntu.com trusty/universe Translation-en_US
Ign http://repo.mysql.com trusty/mysql-8.0 Translation-en_US
Ign http://repo.mysql.com trusty/mysql-8.0 Translation-en
Ign http://repo.mysql.com trusty/mysql-apt-config Translation-en_US
Ign http://repo.mysql.com trusty/mysql-apt-config Translation-en
Ign http://repo.mysql.com trusty/mysql-tools Translation-en_US
Ign http://repo.mysql.com trusty/mysql-tools Translation-en
Reading package lists... Done
vagrant@mob:~$ sudo apt-get mysql-server
E: Invalid operation mysql-server
vagrant@mob:~$ sudo apt-get install mysql-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
mysql-server is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
vag
rant@mob:~$
之后，mysql版本仍然相同。但是，如果我尝试将mysql更新到5.7版而不是8.0版，则上述过程可以完美运行。
为什么我不能更新到mysql 8.0，但可以更新到5.7版？
谢谢！