Problems with headless system

[Jay Ridgley]

Good Morning,

At least I hope you day is good...

I have a headless system that I manage via ssh from another system in my 
network. This morning I got the following:

cdjsys at mateo:~$ sudo apt-get check && sudo apt-get update && sudo 
apt-get dist-upgrade
-bash: /usr/bin/sudo: Input/output error
cdjsys at mateo:~$

I  tried just sudo apt-get check alone and get the same error.

I am logged on as a user in the sudoers file. Up until this morning I 
never had a problem with the above command string. I am running:

Ubuntu 16.04.2 LTS (GNU/Linux 3.2.0-64-generic-pae i686)

Further investigation has yielded that many commands display the same 
error. For example:

cdjsys at mateo:~$ less .bashrc
-bash: /usr/bin/less: Input/output error
cdjsys at mateo:~$

cat .bashrc works fine as does ls -la .

and shows:

-rw-r--r-- 1 cdjsys cdjsys   3214 Apr 25  2013 .bashrc

Any ideas?

Thanks,
Jay
-- 
Jay Ridgley
jridgley2 at austin.rr.com
Registered Linux User ID - 9115
https://linuxcounter.net/cert/9115.png
Registered Ubuntu User ID - 23320