How to remove old files

[Peter Rosa]

Dear list's friends,

I have moved /usr folder via tar to new location. Then I tried to remove
whole /usr and make ln -s to the new location. But there remained files in
original /usr folder - those with readonly access, so I can not remove them
(even when I'm root, 'cause they have permissions like r-xr-xr--, r-sr--r--,
etc.)
Is there any way to remove such files ?

Peter Rosa