kazulog@sv1:~$ cat /etc/os-release | head -2
PRETTY_NAME="Ubuntu 26.04 LTS"
NAME="Ubuntu"
kazulog@sv1:~$ sudo journalctl --list-boots | cat
IDX BOOT ID                          FIRST ENTRY                 LAST ENTRY
  0 015adf7317b542448268332c65381c53 Sat 2026-09-12 09:01:32 JST Sat 2026-09-12 09:08:09 JST
kazulog@sv1:~$ sudo apt update 2>&1 | tail -1
96 packages can be upgraded. Run 'apt list --upgradable' to see them.
kazulog@sv1:~$ apt list --installed 2>/dev/null | grep -E "telnet|inetd" | cat
inetutils-telnet/resolute-updates,resolute-security,now 2:2.7-2ubuntu1.1 amd64 [installed,automatic]
telnet/resolute-updates,resolute-security,now 0.17+2.7-2ubuntu1.1 all [installed,automatic]
kazulog@sv1:~$ apt-cache policy inetutils-telnetd | head -3
inetutils-telnetd:
  Installed: (none)
  Candidate: 2:2.7-2ubuntu1.1
kazulog@sv1:~$ sudo ss -tlnp 'sport = :23'; echo "ss rc=$?"
State                  Recv-Q                  Send-Q                                   Local Address:Port                                   Peer Address:Port                 Process
ss rc=0