Comment 43 for bug 1767402

The topic is not the relevant one here. But the issue is same. I am unable to install, remove or upgrade the virtualbox-ext-pack. This also affects the normal upgrade process if this package need to be upgraded between other packages. This lead to partial install of newer Linux image and rendered the OS non bootable. Here is the output text from terminal:-

$ sudo apt remove virtualbox-ext-pack
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  virtualbox-ext-pack
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 128 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 541278 files and directories currently installed.)
Removing virtualbox-ext-pack (5.2.10-3) ...
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Successfully uninstalled "Oracle VM VirtualBox Extension Pack".
VBoxManage: error: The installer failed with exit code 1: VBoxExtPackHelperApp: error: Failed open the base directory: VERR_FILE_NOT_FOUND ('/usr/lib/virtualbox/ExtensionPacks')
VBoxManage: error: rcExit=1
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackManagerWrap, interface IExtPackManager, callee nsISupports
VBoxManage: error: Context: "Cleanup()" at line 1261 of file VBoxManageMisc.cpp
dpkg: error processing package virtualbox-ext-pack (--remove):
 installed virtualbox-ext-pack package pre-removal script subprocess returned error exit status 1
Errors were encountered while processing:
 virtualbox-ext-pack
E: Sub-process /usr/bin/dpkg returned an error code (1)