Full boot sector linux

• run uname -r
• remove older kernels under /boot/
• run sudo apt-get autoremove --purge

E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
peter@peter-UX430UAR:~$ sudo apt --fix-broken install

• https://askubuntu.com/questions/668582/false-disk-full-error-apt-get-unable-to-install-or-remove