Why am I unable to run sudo commands on my EC2 Linux instance

Hi,

Sometime it doesn't find path to sudo ie. /usr/bin/sudo. Try running "/usr/bin/sudo su -", if it doesn't work and you don't find sudo file at /usr/bin/, then please install sudo as below:

apt install sudo

Then, add your user to the sudo group using:

usermod -aG sudo your_username

You should be able to use sudo now.

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PS: One thing, which I noticed is, there was no space between "su" and "-" in your question, I believe, that's just typo.