Can you check with lsinitramfs if your initrd includes an /etc/hostname?
** Changed in: initramfs-tools (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1920933
** Changed in: systemd (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1920933
Title:
live desktop system booted with ip=dhcp has the right lease, hostname
Also note https://bugs.launchpad.net/subiquity/+bug/1905932
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https://bugs.launchpad.net/bugs/1920933
Title:
live desktop system booted with ip=dhcp has the right lease, hostname
not
** Also affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
** Also affects: initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
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