synergy: error while loading shared libraries: libdns_sd.so.1: cannot open shared object file

在Ubuntu 16.04上使用deb文件安装Synergy时报错，解决过程如下：

安装时提示安装失败，在命令行中打开软件时提示

yang@work:~$ synergy
synergy: error while loading shared libraries: libdns_sd.so.1: cannot open shared object file: No such file or directory

直接的解决办法：

sudo apt-get -f install

结束。

---

以下是解决过程，冗长且很多无用功

按照 https://sourceforge.net/p/beebeep/tickets/118/ 提示的方案，在命令行输入：

sudo apt-get install libqt4-dev libqt4-core libqt4-gui libqt4-xml libxcb-screensaver0 libavahi-compat-libdnssd1 libphonon4 libhunspell-dev

# 但是最后还是会提示两个错误
E: Unable to locate package libqt4-core
E: Unable to locate package libqt4-gui

说明安装包名过时（或不存在了）。 按照类似名称搜索安装：

sudo apt-get install libqt
#利用tab键补全功能得到
Display all 206 possibilities? (y or n)

#找到了这两个相似名称
libqt5gui5    libqt5core5a 

yang@work:~/$ sudo apt-get install libqt5gui5 libqt5core5a
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libqt5core5a is already the newest version (5.5.1+dfsg-16ubuntu7.5).
libqt5core5a set to manually installed.
libqt5gui5 is already the newest version (5.5.1+dfsg-16ubuntu7.5).
libqt5gui5 set to manually installed.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 synergy : Depends: libavahi-compat-libdnssd1 (>= 0.6.25) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

得到提示

“ Try 'apt-get -f install' with no packages (or specify a solution) ”

yang@work:~$ sudo apt-get -f install

 依赖项就安装完毕了，可以正常打开synergy。

One more problem:

第一次使用synergy客户端，始终提示连接不上服务器端

WARNING: failed to connect to server: Timed out
NOTE: connecting to '10.xx.xx.xxx': 
INFO: OpenSSL 1.0.2g  1 Mar 2016
ERROR: ssl error occurred (generic failure)
ERROR: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
ERROR: failed to connect secure socket

 或者这样的

failed to connect secure socket
INFO: stopping synergy desktop process
INFO: process exited normally

原因是软件有一个地方需要设置：

将软件最大化，才能在左上角看到 Edit选项：

在 Edit -> Setting 中，把 Use SSL encryption 的勾选取消掉：

Server 和 Client 都这样设置，然后 Apply, Stop, Start, 就可以了。