How to find date Ubuntu was installed on your computer

One way is to open a terminal (Ctrl-Alt-T) and type the following command:


user@ubuntu:~$ ls -l /var/log/installer
total 836
-rw------- 1 root   root   3209 Apr 20  2013 casper.log
-rw------- 1 root   root   1824 Apr 20  2013 debug
-rw-r--r-- 1 root   root 420795 Apr 20  2013 initial-status.gz
-rw-r--r-- 1 root   root     60 Apr 20  2013 media-info
-rw------- 1 root   root 126817 Apr 20  2013 partman
-rw------- 1 syslog adm  289663 Apr 24  2013 syslog
-rw------- 1 root   root     17 Apr 20  2013 version
user@ubuntu:~$


Observe the dates listed. Ubuntu was installed on my computer on April 20, 2013.