I was trying to install packeges for ns3 but for every command I am getting same error

Question

Error appears in case of installing packages:

E: The package linux-headers-4.15.0-96 needs to be reinstalled

but I can't find an archive for it

Answer 1

Load into a different working generic kernel and purge the one with broken headers:

sudo apt purge *4.15.0-96*

Then you will be able to install packages and compile the new one custom kernel if required.

To boot into different kernel, you could use this.