[Bug]: Installing guest Ubuntu 26.04 LTS snapshot1 hangs with the default 2 GB memory

[m-lw]

Version

7.2.6

Host OS Type

Linux

Host OS name + version

Debian 12.13

Host Architecture

x86

Guest OS Type

Linux

Guest Architecture

x86

Guest OS name + version

Ubuntu 26.04 LTS snapshot1

Component

Unspecified

What happened?

I created a VM for Ubuntu 26.04 LTS snapshot1 using the default options (2 GB of memory). It starts and the Ubuntu installers runs but eventually hangs with the VM using 100% CPU while copying files.

It works after increasing the VM's memory to 4 GB.

How can we reproduce this?

1. Use the GUI to create a VM named Ubuntu 26.04 LTS using the default options (2 GB of memory) and attach the iso from https://releases.ubuntu.com/26.04-snapshot1/ubuntu-26.04-desktop-amd64.iso.
2. Start the VM and wait for the Ubuntu installer to run.
3. Step through the installer with default options.
4. It eventually hangs with the VM using 100% CPU while copying files.
5. The attached log shows is hanging before I powered it off at 00:07:48.

VBox.log

Did you upload all of your necessary log files, screenshots, etc.?

• Yes, I've uploaded all pertinent files to this issue.

[paulsonx]

I created a VM for Ubuntu 26.04 LTS snapshot1 using the default options
(2 GB of memory). It starts and the Ubuntu installers runs but
eventually hangs with the VM using 100% CPU while copying files.

We can adjust the default RAM value but we are following Ubuntu's
documented guidelines for minimum install requirements:

https://help.ubuntu.com/community/Installation/SystemRequirements

Ubuntu Desktop Edition

  1. 2 GHz dual-core processor
  2. 4096 MiB RAM (system memory) for physical installs.
  3. 2048 MiB RAM for virtualised installs.
[...]

Could you file a bug with Ubuntu as well against their documentation?

https://help.ubuntu.com/stable/ubuntu-help/report-ubuntu-bug.html.en

Others creating VMs with either VirtualBox or another product would
benefit from the official documentation being updated as well.

[m-lw]

I can try to get that corrected, but the link you gave is to the community wiki so probably not official documentation.

The crash happens for the 25.10 release as well and the system requirements on the download page (https://ubuntu.com/download/desktop) just say 4 GB without mentioning virtualised installs.