If you use quick create and select one of MS's templates, e.g. Ubuntu 22.04 LTS, the resulting VM generally doesn't have enough space.

If you know this at create time here are steps you can use to increase the space to something useful.

Select quick create and in the quick create select the template you want. ( e.g. Ubuntu 22.04 LTS ) etc
After creation do not connect. Click edit settings
Select the hard drive, note the virtual disk location, and then edit the hard drive
In the edit wizard, select Expand and click next
In the expand panel set the size to what you need and click finish
Click OK to dismiss the editor window
Close the 'Create Virtual Machine' success window without connecting
In Hyper-V Manager edit a linux vm other than the one you just created. ( create a second one if you don't have one ). Add the disk from above as SECOND disk
Boot up this 2nd VM and install gparted if it isn't already install
Run gparted as root. You should be presented with something like the screenshot below. Select Fix

You should then be in the partition editor. Select your disk from the drop down in the upper right hand corner. ( /dev/sdb in this case )

Select the partition 1st partition ( /dev/sdb1 in this case ). Click the resize tool

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