Update cheatsheets

vboxmanage-extpack

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# vboxmanage-extpack
+
+> Manage extension packs for Oracle VirtualBox.
+> More information: <https://www.virtualbox.org/manual/ch08.html#vboxmanage-extpack>.
+
+- Install extension packs to VirtualBox (Note: you need to remove the existing version of the extension pack before installing a new version.):
+
+`VBoxManage extpack install {{path/to/file.vbox-extpack}}`
+
+- Remove the existing version of the VirtualBox extension pack:
+
+`VBoxManage extpack install --replace`
+
+- Uninstall extension packs from VirtualBox:
+
+`VBoxManage extpack uninstall {{extension_pack_name}}`
+
+- Uninstall extension packs and skip most uninstallation refusals:
+
+`VBoxManage extpack uninstall --force {{extension_pack_name}}`
+
+- Clean up temporary files and directories left by extension packs:
+
+`VBoxManage extpack cleanup`