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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 

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Step 1. Install the Wine Team Ubuntu PPA

First start by installing Wine btw it's a utility to install windows apps in linux :

open the Terminal and :

   sudo add-apt-repository ppa:ubuntu-wine/ppa     
   sudo apt-get update && sudo apt-get upgrade
   sudo apt-get install wine1.7 winetricks

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openssl pkcs12 -in MyCertificate.pfx -clcerts -nokeys -out MyCertificate.crt
openssl pkcs12 -in MyCertificate.pfx -nocerts -out MyCertificate-encrypted.key
openssl rsa -in MyCertificate-encrypted.key -out MyCertificate_unenc.key
openssl pkcs12 -export -out MyCertificate_np.pfx -inkey MyCertificate_unenc.key -in MyCertificate.crt -passout pass: