Misc. Ubuntu commands.
Remove Pre-installed
If you don’t know what they are …
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apt purge cloud-* snapd whoopsie* unattended-upgrades ubuntu-advantage-tools
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If not using LVM, LXC/LXD
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apt purge lvm2 lxd lxcfs
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If completely rely on journald.
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apt purge rsyslog libestr0 libfastjson4
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Get Version
Change Timezone
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dpkg-reconfigure tzdata
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systemd-resolver
Ubuntu/Systemd use systemd-resolver for dns lookup and /etc/resolve.conf no longer show the actual upstream dns. Use following to check and change.
Show DNS Settings
Change DNS
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resolvectl dns <interface> <dns1> <dns2> ...
resolvectl dns enp0s2 8.8.8.8 8.8.4.4 1.1.1.1
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Change Search Domain
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resolvectl domain <interface> <domain>
resolvectl domain enp0s2 johnsiu.com
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Disable CPU mitigations
Do this at your own risk.
/etc/default/grub
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GRUB_CMDLINE_LINUX_DEFAULT="noibrs noibpb nopti nospectre_v2 nospectre_v1 l1tf=off nospec_store_bypass_disable no_stf_barrier mds=off mitigations=off"
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Update GRUB
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update-grub
grub-install <boot disk>
grub-install /dev/sda
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Update Initramfs
This is needed if module used during boot is changed.
Ubuntu Release Upgrade
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apt install update-manager-core
do-release-upgrade -d
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