Hi Warkolm,
precisely, what log could I check in the /var/log path?
I'm seeing now but I don't know which file would be better to see
-rw-r--r-- 1 root root 3719 ott 13 17:53 alternatives.log
-rw-r--r-- 1 root root 27436 lug 7 21:12 alternatives.log.1
-rw-r----- 1 root adm 0 ott 14 00:05 apport.log
-rw-r----- 1 root adm 106 ott 13 17:47 apport.log.1
drwxr-xr-x 2 root root 4096 ott 19 15:57 apt
-rw-r----- 1 syslog adm 79680 ott 20 09:48 auth.log
-rw-r----- 1 syslog adm 49890 ott 15 23:15 auth.log.1
-rw-r----- 1 syslog adm 3054 ott 13 17:39 auth.log.2.gz
-rw-r--r-- 1 root root 64547 apr 21 03:03 bootstrap.log
-rw-rw---- 1 root utmp 1200 ott 19 15:38 btmp
-rw-rw---- 1 root utmp 0 apr 21 03:02 btmp.1
-rw-r--r-- 1 root adm 95941 lug 7 20:41 cloud-init.log
-rw-r----- 1 root adm 5018 lug 7 20:41 cloud-init-output.log
drwxr-xr-x 2 root root 4096 ott 20 09:43 cups
drwxr-xr-x 2 root root 4096 apr 18 2022 dist-upgrade
-rw-r----- 1 root adm 43169 ott 20 09:43 dmesg
-rw-r----- 1 root adm 45637 ott 19 17:25 dmesg.0
-rw-r----- 1 root adm 12379 ott 19 15:35 dmesg.1.gz
-rw-r----- 1 root adm 12749 ott 19 14:05 dmesg.2.gz
-rw-r----- 1 root adm 12558 ott 14 13:28 dmesg.3.gz
-rw-r----- 1 root adm 12455 ott 13 19:00 dmesg.4.gz
-rw-r--r-- 1 root root 196274 ott 19 15:57 dpkg.log
-rw-r--r-- 1 root root 1078868 lug 18 15:46 dpkg.log.1
drwxr-s--- 2 elasticsearch elasticsearch 4096 ott 19 15:58 elasticsearch
-rw-r--r-- 1 root root 32032 ott 19 15:57 faillog
-rw-r--r-- 1 root root 10990 ott 13 17:53 fontconfig.log
drwx--x--x 2 root gdm 4096 lug 18 15:42 gdm3
drwxr-xr-x 3 root root 4096 lug 7 21:05 hp
drwxr-x--- 3 root adm 4096 lug 7 20:39 installer
drwxr-sr-x+ 3 root systemd-journal 4096 lug 7 20:41 journal
-rw-r----- 1 syslog adm 323564 ott 20 09:44 kern.log
-rw-r----- 1 syslog adm 276974 ott 16 00:23 kern.log.1
-rw-r----- 1 syslog adm 45792 ott 13 17:39 kern.log.2.gz
drwxr-s--- 2 kibana kibana 4096 ott 19 15:16 kibana
-rw-rw-r-- 1 root utmp 296296 ott 19 15:57 lastlog
drwxr-xr-x 2 root root 4096 mar 22 2022 openvpn
-rw-rw-rw- 1 root root 546323 ott 20 09:48 parallels.log
-rw-r--r-- 1 root root 37079 ott 13 17:40 parallels-tools-install.log
drwx------ 2 root root 4096 apr 21 03:27 private
drwx------ 2 speech-dispatcher root 4096 gen 9 2022 speech-dispatcher
drwxr-x--- 2 root root 4096 feb 24 2022 sssd
-rw-r----- 1 syslog adm 2275857 ott 20 09:48 syslog
-rw-r----- 1 syslog adm 2187206 ott 16 00:23 syslog.1
-rw-r----- 1 syslog adm 95414 ott 13 17:39 syslog.2.gz
-rw-r--r-- 1 root root 0 lug 7 21:06 ubuntu-advantage.log
-rw-r--r-- 1 root root 2298 ott 19 15:01 ubuntu-advantage-timer.log
-rw-r--r-- 1 root root 157 lug 7 21:06 ubuntu-advantage-timer.log.1
drwxr-x--- 2 root adm 4096 ott 13 17:39 unattended-upgrades
-rw-rw-r-- 1 root utmp 25200 ott 20 09:44 wtmp
I found that Elasticsearch automatically add 2 cluster.initial_master_node lines, both populated with a value.
I commented one of these and now Elastic Start.
However, thank u Warkolm for the support.