I have solved the issue manually. No help from update and upgrade. This is how solved it:-
1. Download the official oracle ext package from here https://download.virtualbox.org/virtualbox/5.2.10/Oracle_VM_VirtualBox_Extension_Pack-5.2.10 .vbox-extpack and choose to open with Virtual box. 2. After successful installation of above extension package, removed the virtualbox-ext-pack package with "sudo apt remove virtualbox-ext-pack" command. See the output here:- $ 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". Successfully performed extension pack cleanup Relieved of worries now. :-) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1767402 Title: [SRU] hash mismatch or wrong accept-license key trying to install virtualbox-ext-pack 5.2.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/virtualbox-ext-pack/+bug/1767402/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
