ii  linux-headers-3.13.0-68                               3.13.0-68.111                                               all          Header files related to Linux kernel version 3.13.0
ii  linux-headers-3.13.0-68-generic                       3.13.0-68.111                                               amd64        Linux kernel headers for version 3.13.0 on 64 bit x86 SMP
ii  linux-headers-4.2.4-040204                            4.2.4-040204.201510261009                                   all          Header files related to Linux kernel version 4.2.4
ii  linux-headers-4.2.4-040204-generic                    4.2.4-040204.201510261009                                   amd64        Linux kernel headers for version 4.2.4 on 64 bit x86 SMP
ii  linux-headers-generic                                 3.13.0.68.74                                                amd64        Generic Linux kernel headers