I am using 64-bit Windows 10 Machine and Installed the Ubuntu18.04 in VirtualBox. I am getting below messages while running the sh if_machine_is_64-bit.sh prashant@prashant-VirtualBox:~/work$ sh if_machine_is_64-bit.sh [sudo] password for prashant: Reading package lists... Done Building dependency tree Reading state information... Done Package ia32-libs is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it: lib32ncurses5 lib32z1 Package lib32readline-gplv2-dev is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'lib32readline-gplv2-dev' has no installation candidate E: Package 'ia32-libs' has no installation candidate Could please let me know how to proceed further or let us know the alternative packages to setup the Environment for compiling.