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5

Un-removable /etc/resolv.conf

rated 0 times [ 5] [ 0] / answers: 1 / hits: 16056 / 1 Year ago, wed, march 8, 2023, 5:44:33

During an upgrade to 12.04 today I've got an error when running post-install hook for resolvconf package:

Setting up resolvconf (1.63ubuntu11) ...

resolvconf.postinst: Error: Cannot replace the current /etc/resolv.conf with a symbolic link because it is immutable. To correct this problem, gain root privileges in a terminal and run 'chattr -i /etc/resolv.conf' and then 'dpkg --configure resolvconf'. Aborting.

Well, surely I tried running chattr -i /etc/resolv.conf, but dpkg --configure resolvconf produced the same error.

I tried to move or delete the file manually, but I can't do this even as root:

sudo mv /etc/resolv.conf /etc/resolv.conf.old 

mv: cannot move `/etc/resolv.conf' to `/etc/resolv.conf.old': Operation not permitted



sudo rm /etc/resolv.conf                                                       

rm: cannot remove `/etc/resolv.conf': Operation not permitted

I am able to create and then delete a file in /etc (as root), so the root partition is not mounted read-only or anything. Also:

lsattr /etc/resolv.conf

-----a--------- /etc/resolv.conf

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finatch

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2 Years ago

answered 1 Year ago pilun · Accepted Answer

as per the help files (man chattr),

A  file  with the `a' attribute set can only be open in append mode for writing.

In your case the file has this attribute

The  operator  `+'  causes  the  selected attributes to be added to the

       existing attributes of the files; `-' causes them to  be  removed;

So the command to try would be

sudo chattr -a /etc/resolv.conf

and try listing the attributes once again using

lsattr /etc/resolv.conf

Then try deleting the file