Erro ao instalar o virtualbox 5.2 no ubuntu 16.04 [duplicate]

Question

sumit@sumit-Vostro-15-3568:~$ sudo apt-get install virtualbox
N: Ignoring file 'virtualbox.listM-A' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
E: Malformed entry 1 in list file /etc/apt/sources.list.d/virtualbox.list (Suite)
E: The list of sources could not be read.
N: Ignoring file 'virtualbox.listM-A' in directory '/etc/apt/sources.list.d/' as it has an invalid filename extension
E: Malformed entry 1 in list file /etc/apt/sources.list.d/virtualbox.list (Suite)
E: The list of sources could not be read.