flackend

#!/bin/sh -e

for attr in $(seq 0 1); do
  for fg in $(seq 30 37); do
    for bg in $(seq 40 47); do
      printf "\033[$attr;${bg};${fg}m$attr;$fg;$bg\033[m "
    done
    echo
  done
done

ipbastola

Safest way to clean up boot partition - Ubuntu 14.04LTS-x64, Ubuntu 16.04LTS-x64

Reference

Case I: if /boot is not 100% full and apt is working

1. Check the current kernel version

$ uname -r