Answer by gingamann for How to roll-back or downgrade kernel on 14.04 (re: Wine stopped working)?

When you first boot up your machine you should see the grub boot menu. At the grub boot menu choose the older Kernel you want to boot to - Once you have chosen the Kernel you want to keep and you have booted into it

uname -r

will tell you what kernel you are currently running on (measure twice cut once)

dpkg -l | grep linux-imagedpkg -l | grep linux-headers

will tell you what kernels/headers are saved on your system - I will also delete the headers - though they dont take up too much space i still purge them, why have them if I am deleting the kernel?

Be advised that it is important to NOT delete the Kernel you are running i.e uname -r Deleting these kernel and header entries will make your system unusable

then just delete the ones you dont want:

sudo apt-get purge 

I will copy the output of dpkg -l | grep linux-image to a text document so that it is an un-messy process and i can clearly choose what i want to delete vs save

an example of what the full command will look like:

sudo apt-get purge linux-image-3.16.0-41-generic linux-image-3.16.0-41-lowlatency linux-image-extra-3.16.0-41-generic sudo apt-get purge linux-headers-3.16.0-41 linux-headers-3.16.0-41-generic linux-headers-3.16.0-41-lowlatency 

an example of what the output of dpkg -l | grep linux-headers will look like:

jason@casa-wesella:~$ dpkg -l | grep linux-headersii  linux-headers-3.16.0-41                     3.16.0-41.57~14.04.1                    all          Header files related to Linux kernel version 3.16.0ii  linux-headers-3.16.0-41-generic             3.16.0-41.57~14.04.1                    i386         Linux kernel headers for version 3.16.0 on 32 bit x86 SMPii  linux-headers-3.16.0-41-lowlatency          3.16.0-41.57~14.04.1                    i386         Linux kernel headers for version 3.16.0 on 32 bit x86 SMPii  linux-headers-3.16.0-43                     3.16.0-43.58~14.04.1                    all          Header files related to Linux kernel version 3.16.0ii  linux-headers-3.16.0-43-generic             3.16.0-43.58~14.04.1                    i386         Linux kernel headers for version 3.16.0 on 32 bit x86 SMPii  linux-headers-3.16.0-43-lowlatency          3.16.0-43.58~14.04.1                    i386         Linux kernel headers for version 3.16.0 on 32 bit x86 SMPii  linux-headers-generic-lts-utopic            3.16.0.43.34                            i386         Generic Linux kernel headersii  linux-headers-lowlatency-lts-utopic         3.16.0.43.34                            i386         lowlatency Linux kernel headers