Custom Query (16363 matches)
Results (1786 - 1788 of 16363)
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Ticket
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Resolution
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Summary
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Owner
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Reporter
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| #15182 |
wontfix
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VirtualBox Guru Meditation crash with grub2, EFI, and grub digital signatures
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JamesJohnston
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| Description |
The grub2 bootloader crashes VirtualBox with a "Guru Meditation" critical error if EFI is used and digital signatures are enabled within grub.
Complete steps to reproduce this crash from a virtual machine that is made from scratch are below:
Steps to reproduce:
- Open VirtualBox 5.0.15 r105747 test build on 64-bit Windows 7 SP1. (I have Core i5-2520M CPU with VT-x, EPT, and VT-d on ThinkPad T420.) Problem also happens with VBox 5.0.14.
- Click the New button to make a new virtual machine with these settings:
- Name: GrubTest
- Type: Linux
- Version: Ubuntu (64-bit)
- Memory size: 4096 MB
- Virtual disk size: 6 GB, dynamically allocated, VDI file type
- Go to the Settings of the new virtual machine; set these settings:
- Important: System: set "Enable EFI" to enable the EFI firmware. (Maybe it also happens on non-EFI BIOS, but I haven't tested).
- Storage: set DVD drive to ubuntu-15.10-server-amd64.iso (SHA-1 478446F33E336A98D5868C0B353D0D347E8A7262)
- NOTE: You can get this Ubuntu Server 64-bit installer from: http://releases.ubuntu.com/15.10/ubuntu-15.10-server-amd64.iso
- Network: set as you need to get on the Internet; I left mine with default NAT settings.
- USB: USB 1.1 controller enabled (not 2.0, but problem also was reproduced on VBox 5.0.14 stable with USB2 enabled).
- Start the VM. The Ubuntu installer starts. Use default settings in the Ubuntu installer, except where noted:
- Hostname: ubuntu
- User full name: James Johnston
- Username: james
- Password: password
- Encrypt home dir: no
- Time zone: set as appropriate; mine defaulted to America/Chicago and I left it there.
- Partition disks: To simplify things, I changed default to "Guided - use entire disk" (i.e. not use LVM). Default partitioning for me was EFI system partition, ext4, and swap.
- Automatic updates: No automatic updates
- Software selection: No items selected
- Reboot when prompted by the installer. (The CD is automatically ejected)
- Log into your new ubuntu system: james / password - then run:
# Generate new GPG key as root (go to root shell first)
sudo su
gpg --gen-key
# Press Enter; use defaults - except pick 1024 bit RSA key size (it will be faster)
# Make up some information for the Real Name and e-mail when prompted.
# Press Enter twice when prompted for passphrase: this means no passphrase.
- The virtual machine doesn't have much entropy for key generation. To speed up GPG key generation, press Alt+F2 to go to second terminal. Log in again, and make some entropy:
sudo su
while true ; do echo -n . ; echo 3 > /proc/sys/vm/drop_caches ; ls / -R > /dev/nul ; done
Use Alt+F1 to go back to monitoring GPG key generation. When it finishes, Alt+F2 and then Ctrl+C to abort the above operation (it makes your computer slow).
- Now you have a GPG key. Sign some grub files with it and make grub use it:
# Go to root shell
sudo su
# Extract public key and install grub that uses it:
gpg --output grubkey --export
grub-install --pubkey=grubkey --modules=verify --no-uefi-secure-boot
# Sign everything in /boot
cd /boot
find -type f -print0 | xargs -0 -n 1 gpg --batch --detach-sign --yes
- Reboot the VM:
sudo reboot
- Actual behavior: When the VM reboots and attempts to start grub, I get a VirtualBox - Guru Meditation:
A critical error has occurred while running the virtual machine and the machine execution has been stopped.
Expected behavior: The VM boots into grub as usual, not crash the VM.
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| #8417 |
worksforme
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Installing VM Additions CD Breaks Edubuntu GUI
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JamesR123
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| Description |
My host is running Windows 7 Home Premium 64 bit with 4GB RAM using Asus P5KPL-CM motherboard, latest BIOS (7.02)
using SSD - OCZ Vertex 2 120GB drive.
After I installed the VM Additions CD and rebooted Edubuntu, the screen is either black, white or corrupted and I can't capture the mouse.
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| #21142 |
duplicate
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with 2 monitor with different display resolution the mouse does't works => duplicate of #21143
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JamesTKirk
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| Description |
Using the version 7 of Virtualbox, configured with two screens as per the attached images, configured to the maximum occupancy of the video, the mouse moves everywhere but the click is not located in the correct place on the X axis so it becomes impossible to select or open and close windows or interact with the system. The further you move away from the left side of the first screen, the more the error increases. Fortunately, you can select the windows menu and shut down the operating system. Conversely, if I use only one monitor, even on the ultrawide screen I have no problems.
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