ii  linux-headers-4.0.0-040000                                  4.0.0-040000.201504121935             all          Header files related to Linux kernel version 4.0.0
ii  linux-headers-4.0.0-040000rc5                               4.0.0-040000rc5.201503230035          all          Header files related to Linux kernel version 4.0.0
ii  linux-headers-4.0.0-040000rc6                               4.0.0-040000rc6.201503291935          all          Header files related to Linux kernel version 4.0.0
ii  linux-headers-4.0.0-040000rc7                               4.0.0-040000rc7.201504061936          all          Header files related to Linux kernel version 4.0.0
ii  linux-headers-4.1.0-040100rc1                               4.1.0-040100rc1.201504270235          all          Header files related to Linux kernel version 4.1.0
ii  linux-headers-4.1.0-040100rc2                               4.1.0-040100rc2.201505032335          all          Header files related to Linux kernel version 4.1.0
ii  linux-headers-4.1.0-040100rc4                               4.1.0-040100rc4.201505181436          all          Header files related to Linux kernel version 4.1.0
ii  linux-headers-4.1.0-040100rc4-generic                       4.1.0-040100rc4.201505181436          amd64        Linux kernel headers for version 4.1.0 on 64 bit x86 SMP
iF  virtualbox                                                  4.3.28-dfsg-1build1                   amd64        x86 virtualization solution - base binaries
iU  virtualbox-dkms                                             4.3.28-dfsg-1build1                   all          x86 virtualization solution - kernel module sources for dkms
ii  virtualbox-guest-dkms                                       4.3.28-dfsg-1build1                   all          x86 virtualization solution - guest addition module source for dkms
ii  virtualbox-guest-utils                                      4.3.28-dfsg-1build1                   amd64        x86 virtualization solution - non-X11 guest utilities
ii  virtualbox-guest-x11                                        4.3.28-dfsg-1build1                   amd64        x86 virtualization solution - X11 guest utilities
iU  virtualbox-qt                                               4.3.28-dfsg-1build1                   amd64        x86 virtualization solution - Qt based user interface