This may be a dumb question, and a bit of a long shot, but have you
tried rebooting?  I know that's not often necessary in Linux but it's
possible that some process somewhere has not picked up the changed disk
status and permissions.

The only other thing I can think of is whether you have some kind of
mandatory access control (e.g. apparmour) in effect?

On 14/10/2017 11:09, Mark Rogers via Peterboro wrote:
>
> On 14 October 2017 at 16:22, Chris Sandles <summersh...@tiscali.co.uk
> <mailto:summersh...@tiscali.co.uk>> wrote:
>
>     Assuming you've cleared some space in your hard drive now.
>     Apologies if you've already tried this, but worth checking
>     permissions on the command line for /usr/bin using ls -l
>
> Permissions show as "drwxr-xr-x" which is as I'd expect. 
>
> There is now over 10GB disk free.
>
> # sudo mkdir /usr/bin/test123
> mkdir: cannot create directory ‘/usr/bin/test123’: Permission denied
> # sudo mkdir /usr/sbin/test123
> mkdir: cannot create directory ‘/usr/sbin/test123’: Permission denied
> # sudo mkdir /usr/lib/test123
> (succeeds)
>
> All are on the same partition (there is only one partition). All have
> the same permissions (at least as far as ls shows me, and acls are not
> installed/enabled).
>
> -- 
> Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450
> Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER
>
>

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