Xenial上的NetworkManager权限错误

Question

所以我搞砸了。我试图在NetworkManager中安装一个虚拟专用网，结果意外地删除了整个服务(不知怎么的.仍不确定这是如何发生的)。所以我试着从头开始重新安装。警告:我可能在这里做了件蠢事--事先道歉。

我下载了tar包，然后从头开始重新构建它。重新启动电脑，看上去启动得很好。但是当我试图连接wifi时，它只是挂了一段时间。运行service NetworkManager status我看到了：

● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/local/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running) since Sat 2016-09-17 11:34:09 EDT; 31s ago
 Main PID: 2418 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
           ├─2418 /usr/local/sbin/NetworkManager --no-daemon
           └─3724 /sbin/dhclient -d -q -sf /usr/local/libexec/nm-dhcp-helper -pf /usr/local/var/run/dhclient-wlp2s0.pid -lf /usr/loc

Sep 17 11:34:26 yichijin-Lemur-Ultra dhclient[3725]: execve (/usr/local/libexec/nm-dhcp-helper, ...): Permission denied
Sep 17 11:34:26 yichijin-Lemur-Ultra dhclient[3724]: DHCPDISCOVER on wlp2s0 to 255.255.255.255 port 67 interval 3 (xid=0xf46a306b)
Sep 17 11:34:26 yichijin-Lemur-Ultra dhclient[3724]: Can't create /usr/local/var/run/dhclient-wlp2s0.pid: Read-only file system
Sep 17 11:34:29 yichijin-Lemur-Ultra dhclient[3724]: DHCPDISCOVER on wlp2s0 to 255.255.255.255 port 67 interval 4 (xid=0xf46a306b)
Sep 17 11:34:30 yichijin-Lemur-Ultra dhclient[3724]: DHCPREQUEST of 192.168.1.146 on wlp2s0 to 255.255.255.255 port 67 (xid=0x6b306a
Sep 17 11:34:30 yichijin-Lemur-Ultra dhclient[3724]: DHCPOFFER of 192.168.1.146 from 192.168.1.1
Sep 17 11:34:30 yichijin-Lemur-Ultra dhclient[3724]: DHCPACK of 192.168.1.146 from 192.168.1.1
Sep 17 11:34:30 yichijin-Lemur-Ultra dhclient[3724]: can't create /usr/local/var/lib/NetworkManager/dhclient-b1cfa2a8-395a-4fe9-af77
Sep 17 11:34:30 yichijin-Lemur-Ultra dhclient[3724]: bound to 192.168.1.146 -- renewal in 39965 seconds.
Sep 17 11:34:30 yichijin-Lemur-Ultra dhclient[3724]: Can't create /usr/local/var/run/dhclient-wlp2s0.pid: Read-only file system

显然是某种只读权限问题。我不确定在构建原始包时是否配置不正确，但我尝试从NetworkManager包重新安装.deb，但仍然存在相同的问题。所以当我第一次尝试重新安装的时候，我肯定弄坏了一些东西。

谁能给我指明正确的方向？我有点过头了。

Answer 1

可能是因为系统的NetworkManager.service文件包含ProtectSystem=true，这导致systemd将/usr挂载为只读。

在构建时，可以指定NetworkManager安装/var/run等路径的位置。见./configure --help。

如果这是一个学习练习，那么很好。否则我就会用你分发的包裹.apt-get install network-manager。