我有一个正在运行的Ubuntu AWS实例，并且我正在尝试更改一些权限：
当我访问我的新安装站点的IP地址时，我收到以下警告：
The /var/www/seekadventure.net directory is not writable.
Please chmod this directory and its contents to 0775.
于是在命令行中，我尝试了这个：
ubuntu@ip-172-31-80-211:/var/www$ sudo chmod 0775 /var/www/seekadventure.net
ubuntu@ip-172-31-80-211:/var/www$ ls -la
total 20
drwxr-xr-x 5 root root 4096 Dec 14 05:32 .
drwxr-xr-x 14 root root 4096 Feb 27 2018 ..
drwxr-xr-x 12 www-data www-data 4096 Feb 28 2018 laravel5.6
drwxrwxr-x 5 root root 4096 Dec 14 05:34 seekadventure.net
drwxr-xr-x 3 www-data www-data 4096 Nov 8 13:32 utility
ubuntu@ip-172-31-80-211:/var/www$
从ls -la命令可以看出，它仍然是root root
你有什么想法为什么权限没有改变吗？
更新：
在进一步调查时，我发现mount命令可以显示更多有用的信息：
ubuntu@ip-172-31-80-211:/var/www$ mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=2014540k,nr_inodes=503635,mo de=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmod e=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=404508k,mode=755)
/dev/xvda1 on / type ext4 (rw,relatime,discard,data=ordered)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relat ime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xa ttr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpu set)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hu getlb)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatim e,cpu,cpuacct)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime ,perf_event)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,mem ory)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,fr eezer)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,re latime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,de vices)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blki o)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=31,pgrp=1,time out=0,minproto=5,maxproto=5,direct)
mqueue on /dev/mqueue type mqueue (rw,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,relatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime)
lxcfs on /var/lib/lxcfs type fuse.lxcfs (rw,nosuid,nodev,relatime,user_id=0,grou p_id=0,allow_other)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=404508k,mode=7 00,uid=1000,gid=1000)
ubuntu@ip-172-31-80-211:/var/www$