I'm trying to update and upgrade the Ubuntu Server 12.04 in order to fix the OpenSSL vulnerability (bring it to the latest version). The problem I'm having with this is that once I download the updates and it works fine, I run the sudo apt-get upgrade and it tells to me to fix some unmet dependencies. I run sudo apt-get -f install and after confirming the upgrade that takes almost 296MB errors out by telling me no space left on device. I've tried to clean up the boot partition and increased the size of it but still no luck. The root partition is already big enough for that if it's using it. I'm thinking it's not really disk space issue but rather it doesn't see the mount. It is unable to create /usr/src/linux-headers-* and errors while processing /var/cache/apt/archives/linux-headers-*. I am running out of ideas how to fix this. Help is appreciated.