我们最近从 10.04 升级到 14.04。
我们有一些保留的软件包，我们会不时对其进行升级。似乎在 14.04 上，当您安装或升级软件包时，它会删除对该软件包的保留。
$ dpkg --get-selections libmysqlclient18
libmysqlclient18:amd64 install
# Hold the package
$ echo 'libmysqlclient18:amd64 hold' | sudo dpkg --set-selections
# Check that worked
$ dpkg --get-selections libmysqlclient18
libmysqlclient18:amd64 hold
# Install a new version of the package
$ sudo apt-get install libmysqlclient18
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
mysql-common
The following held packages will be changed:
libmysqlclient18
The following packages will be …