GUI with PyQt5 QtGui do not start on VirtualBox VM

[Norbert]

Steps to reproduce:
1. Install Ubuntu 19.04 on VirtualBox VM (5.1.38 host in my case)
2. Enable 3D acceleration on the VM
3. Install VirtualBox guest additions into guest with `sudo apt-get install virtualbox-guest-x11` (or `sudo apt-get install virtualbox-guest-x11-hwe`) and reboot VM
4a. Install HPLIP GUI with `sudo apt-get install hplip-gui`
4b. Install Retext with `sudo apt-get install retext`
5a. Try to launch HPLIP Toolbox with `hp-toolbox`
5b. Try to launch Retext with `retext`

Expected results:
* HPLIP Toolbox is shown and have trayicon ; Retext launched

Actual results:
* HPLIP Toolbox window is not shown, trayicon is not shown. ; Retext is not launched. Got error message in the terminal:

```
error: /lib/VBoxOGLcrutil.so: undefined symbol: crypt_r
```

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: hplip-gui 3.19.1+dfsg0-1
ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1
Uname: Linux 5.0.0-8-generic x86_64
ApportVersion: 2.20.10-0ubuntu25
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Apr 8 14:42:12 2019
InstallationDate: Installed on 2019-04-08 (0 days ago)
InstallationMedia: Ubuntu-MATE 19.04 "Disco Dingo" - Alpha amd64 (20190408)
Lpstat: Error: command ['lpstat', '-v'] failed with exit code 1: lpstat: No destinations added.
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
PackageArchitecture: all
Papersize: letter
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-8-generic root=UUID=b256c639-5b80-4c01-a5b2-672fb0e29114 ro quiet splash
SourcePackage: hplip
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.family: Virtual Machine
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH

[Gianfranco Costamagna (costamagnagianfranco)]

This looks like an upstream issue... can you please open an upstream ticket?

[Gianfranco Costamagna (costamagnagianfranco)]

this should be good in later virtualbox releases