https://github.com/pfn/keepasshttp/
sudo apt-get install mono-complete
如果使用过程中有报错信息，运行如下命令安装可能缺失的库/组件
sudo apt-get install libmono-system-xml-linq4.0-cil libmono-system-data-datasetextensions4.0-cil libmono-system-runtime-serialization4.0-cil mono-mcs
然后在ubuntu中安装keepass2，keepass2已经进入ubuntu官方仓库，直接apt安装即可
sudo apt-get install keepass2
然后就已经可以运行keepass2了，
keepass2 &
安装KeepassHttp,参考链接：https://github.com/pfn/keepasshttp/
下载https://raw.github.com/pfn/keepasshttp/master/KeePassHttp.plgx，
解压到/usr/lib/keepass2/ 目录下
设置644权限 chmod 644 /usr/lib/keepass2/KeePassHttp.plgx
重启Keepass2即可