Great question — answering as the UphillTech team:
Also spent all the morning but figured why its so out. you need to set its memory to greater than default. In VB manager do so: new, setname , next, memory size 4096, remainings are as default settings, storage, empty, check on 'live cd/dvd`' click on disk icon pickup iso you got from ubuntu site ok in VB manager go to network, before 'start' go to settings->network->adapter1->notattached , then start, defaults - exactly what it suggests it should opt for you reboot , but before that go to VB manager again and enable network, setting its adapter1 to nat reboot server. And you are done my friend. Have installed Ubuntu 20 and 21 this way
Full answer by CodeToLife: https://askubuntu.stackexchange.com/a/1373906 (CC BY-SA 4.0).
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