How about on a console? i.e. clt-alt-F3
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Try post again. 
Live ISO, garuda-chroot, "upd" in terminal, sounds like broken update.
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Or if you have sudo and timeshift problems, since you're already root in chroot, you could try directly
reflector --country Germany --latest 5 --age 2 --fastest 5 --protocol https --sort rate --save /etc/pacman.d/mirrorlist && cat /etc/pacman.d/mirrorlist && SKIP_AUTOSNAP=1 pacman -Syu
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I am lazy, upd is the same 
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@SGS Tried. Response command not found
@filo Updated but still no sudo, timeshift, network after reboot.
@anon72786180 Tried to sudo and su but no joy. sudo is owned by pid 1000 not 0. Su unable to load groups (I think).
Have to keep skipping back and forward between garuda live, garuda installed and arco.
Many thanks for all you help. Sorry about late reply.
It is inside .bashrc, .zshrc, fish.config since many, many months, on i3wm since start.
But you can catch up on it yourself if you like.
Did you use ext4 or Btrfs?
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Give a look at this one.
https://bbs.archlinux.org/viewtopic.php?id=261557
Try to chroot again and chown root: root for
/etc/sudo.conf and /usr/bin/sudo
Maybe it helps...
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Btrfs as default.
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Thanks for that link. Have also been searching on various terms but still nothing seems to work.. Tried chown vi chroot and also from thunar via arco. both appear to be owned by root:root, but sudo needs set uid set. Am currently searching as this is new to me. Have also encountered a problem in that the installed garuda seems to no longer accept the root password.. Next step is to reinstall again and use different mirrors and see if that resolves this.
Very many thanks to all who have helped/advised me on this. Will mark this as closed and start from scratch. You all have helped me increase my knowledge of linux/arch. Many thanks for all you have done (again).
Good day to all.