I accidentally ran this command chmod -R 755 /usr/bin on my remote server [Ubuntu 12.04.3 LTS], and I don't have the root password.
When I run sudo it gives me sudo: must be setuid root, This is the /bin folder permissions
drwsr-xr-x 2 deployer root 40960 juil. 23 11:54 bin
SSH connexion is the only access I have to my remote server.
Your error message is caused by sudo being owned by deployer, in addition, the rights are set incorrectly. To fix the permissions, try something like chmod 4755 /usr/bin/sudo, as you own sudo currently.
To fix the ownership, you need to run chown root:root /usr/bin/sudo ...but you might need to be root for that. Unless you have +s set on /bin/chown, and without root password or recovery console/alternative boot method, there is probably no way. So, you can try the above chown command with your normal user, but most likely you will have to re-install.
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