Linux-如何更改/的chmod

Question

How can I change chmod of /?

When I run

chmod 755 /

under root, I get

Operation not permitted

Why I need it?

I am installing (logged as root) apt-get install memcached and I get error:

failed to move /initrd.img:Permission denied at /var/lib/dpkg/info/linux-image-3.2.0-26-generic.postinst line 495.

Answer 1

I suppose that your root filesystem is mounted readonly. You need to check it, for example, creating a file in /root :

# touch /root/hello

Then you will see if it is really so.

If it mounted readonly, you can try to remount it rewrite and see what happened:

# mount -o rw,remount /

Ok, how we've known after the discussion there were an immutable bit on the filesystem.

# lsattr -d /
----i--------e- /

You can remove this bit with chattr -i / . Don't forget to set it back after your operations:

# chattr -i /
# # something
# chattr +i /

Answer 2

Do you have root privileges? Mere mortals (ie, regular users :-) are not permitted to make these changes

Answer 3

尝试使用为您提供超级用户特权的sudo，就像其他人会提到的那样，这种东西就像巫术，如果它发生了严重错误，那么至少可以说您的系统将“不稳定”。

Answer 4

Apt-get doesn't need to change permissions for / or first degree children. Which command do you

Answer 5

use yum tools for installing it automatically clear all the permission and other installing problems . use this command
1. Login as root
2. change permissions of \\
chmod 777 *
3.install bmemcached
* yum install bmemcached**