save module to a specified path

PS /root> save-Module -Name ImportExcel -literalPath ~ -v
VERBOSE: Acquiring providers for assembly: /opt/microsoft/powershell/6-preview/Modules/PackageManagement/1.1.7.0/coreclr/netcoreapp2.0/Microsoft.PackageManagement.CoreProviders.dll
VERBOSE: Acquiring providers for assembly: /opt/microsoft/powershell/6-preview/Modules/PackageManagement/1.1.7.0/coreclr/netcoreapp2.0/Microsoft.PackageManagement.NuGetProvider.dll
VERBOSE: Acquiring providers for assembly: /opt/microsoft/powershell/6-preview/Modules/PackageManagement/1.1.7.0/coreclr/netcoreapp2.0/Microsoft.PackageManagement.MetaProvider.PowerShell.dll
VERBOSE: Acquiring providers for assembly: /opt/microsoft/powershell/6-preview/Modules/PackageManagement/1.1.7.0/coreclr/netcoreapp2.0/Microsoft.PackageManagement.ArchiverProviders.dll
VERBOSE: Using the provider 'PowerShellGet' for searching packages.
VERBOSE: The -Repository parameter was not specified.  PowerShellGet will use all of the registered repositories.
VERBOSE: Getting the provider object for the PackageManagement Provider 'NuGet'.
VERBOSE: The specified Location is 'https://www.powershellgallery.com/api/v2/' and PackageManagementProvider is 'NuGet'.
VERBOSE: Searching repository 'https://www.powershellgallery.com/api/v2/FindPackagesById()?id='ImportExcel'' for ''.
VERBOSE: Total package yield:'1' for the specified package 'ImportExcel'.
VERBOSE: Performing the operation "Save Package" on target "'ImportExcel' to location '/root'".
VERBOSE: The specified module will be installed in '/root'.
VERBOSE: The specified Location is 'NuGet' and PackageManagementProvider is 'NuGet'.
VERBOSE: Downloading module 'ImportExcel' with version '5.1.1' from the repository 'https://www.powershellgallery.com/api/v2/'.
VERBOSE: Searching repository 'https://www.powershellgallery.com/api/v2/FindPackagesById()?id='ImportExcel'' for ''.
VERBOSE: InstallPackage' - name='ImportExcel', version='5.1.1',destination='/tmp/151645995'
VERBOSE: DownloadPackage' - name='ImportExcel', version='5.1.1',destination='/tmp/151645995/ImportExcel.5.1.1/ImportExcel.5.1.1.nupkg', uri='https://www.powershellgallery.com/api/v2/package/ImportExcel/5.1.1'
VERBOSE: Downloading 'https://www.powershellgallery.com/api/v2/package/ImportExcel/5.1.1'.
VERBOSE: Completed downloading 'https://www.powershellgallery.com/api/v2/package/ImportExcel/5.1.1'.
VERBOSE: Completed downloading 'ImportExcel'.
VERBOSE: InstallPackageLocal' - name='ImportExcel', version='5.1.1',destination='/tmp/151645995'
WARNING: Administrator rights are required to install or update. Log on to the computer with an account that has Administrator rights, and then try again, or install by adding "-Scope CurrentUser" to your command. You can also try running the Windows PowerShell session with elevated rights (Run as Administrator).
PackageManagement\Save-Package : Unable to save the module 'ImportExcel'.
At /opt/microsoft/powershell/6-preview/Modules/PowerShellGet/1.6.0/PSModule.psm1:1835 char:21
+             $null = PackageManagement\Save-Package @PSBoundParameters
+                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (Microsoft.Power...ets.SavePackage:SavePackage) [Save-Package], Exception
+ FullyQualifiedErrorId : ProviderFailToDownloadFile,Microsoft.PowerShell.PackageManagement.Cmdlets.SavePackage