For uninstall package, i have errors :
I want to install : virtualbox-5.2_5.2.0-118431~Ubuntu~xenial_amd64.debsudo dpkg --force-all --purge virtualbox-5.1_5.1.28-117968~Ubuntu~xenial_amd64.deb
dpkg: error: --purge needs a valid package name but 'virtualbox-5.1_5.1.28-117968~Ubuntu~xenial_amd64.deb' is not: illegal package name in specifier 'virtualbox-5.1_5.1.28-117968~Ubuntu~xenial_amd64.deb': character '~' not allowed (only letters, digits and characters '-+._')
Type dpkg --help for help about installing and deinstalling packages [*];
Use 'apt' or 'aptitude' for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;
Options marked [*] produce a lot of output - pipe it through 'less' or 'more' !
@+
Help me