id summary reporter owner description type status component version resolution keywords cc guest host 17034 ExtPack installation failure D-H "I have VirtualBox running as an unprivileged user on a RHEL 7.4 server with no GUI, phpvirtualbox is installed on this machine. I've recently upgraded to 5.1.26 and I'm trying to install the extension pack so I have console access to my VMs which are mostly used as build machines. Trying to install as the unprivileged user gives the following error: {{{ vbox@virthost:~$ vboxmanage extpack install ~/Oracle_VM_VirtualBox_Extension_Pack-5.1.26-117224.vbox-extpack --accept-license=715c7246dc0f779ceab39446812362b2f9bf64a55ed5d3a905f053cfab36da9e License accepted. 0%... Progress state: NS_ERROR_FAILURE VBoxManage: error: Failed to install ""/repo/vbox/vbox/Oracle_VM_VirtualBox_Extension_Pack-5.1.26-117224.vbox-extpack"" VBoxManage: error: The installer failed with exit code 127: Error creating textual authentication agent: Error opening current controlling terminal for the process (`/dev/tty'): No such device or address VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackManagerWrap, interface IExtPackManager VBoxManage: error: Context: ""RTEXITCODE handleExtPack(HandlerArg*)"" at line 1201 of file VBoxManageMisc.cpp vbox@virthost:~$ }}} It is possible to install the extpack as root or with sudo but this only makes the extensions available for root and not as the unprivileged user that is running the VMs." defect closed other VirtualBox 5.1.26 obsolete other Linux