firefly@firefly:~/tmp$ sudo apt-get install linux-headers-$(uname -r)
Reading package lists… Done
Building dependency tree
Reading state information… Done
E: Unable to locate package linux-headers-4.4.194-59119-g968ba5005831
E: Couldn’t find any package by glob ‘linux-headers-4.4.194-59119-g968ba5005831’
E: Couldn’t find any package by regex ‘linux-headers-4.4.194-59119-g968ba5005831’