我遇到了 Geary 无法安装的问题，即使多次尝试也无济于事。以下是我收到的错误。请告诉我纠正措施是什么，谢谢！
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
geary : Depends: libgee-0.8-2 (>= 0.14.0) but 0.10.5-1ubuntu1 is to be installed
E: Unable to correct problems, you have held broken packages.
答案1
安装以下 ppa：https://launchpad.net/~vala-team/+archive/ubuntu/ppa
使用：
sudo add-apt-repository ppa:vala-team/ppa
然后执行更新和升级
sudo apt-get update
sudo apt-get upgrade
之后，只需安装 geary （从每日 ppa）
sudo apt-get install geary