My googlefu has failed me. What packages are part of the "standard system utilities" that is preselected during install?
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I assume you mean on the software selection screen near the end of the install.
You can see the list of packages after install using tasksel
sudo tasksel --task-package standard
Your server will run fine with or without them and you can always install them later. They are all mostly convenience things like nano and ftp. If you want to save some space on your install unselect it and just install the utilities you want.
Here is the list for the 16.04 LTS release standard system utilities
manpages dnsutils bsdmainutils psmisc python3-gdbm ufw dosfstools ed telnet powermgmt-base ntfs-3g ubuntu-release-upgrader-core iputils-tracepath python3-update-manager groff-base python3-distupgrade bind9-host mtr-tiny bash-completion mlocate tcpdump geoip-database install-info irqbalance language-selector-common friendly-recovery command-not-found info hdparm man-db lshw update-manager-core apt-transport-https accountsservice command-not-found-data python3-commandnotfound time ltrace parted popularity-contest strace ftp ubuntu-standard lsof