Jenkins is fully up and running but not accessible on browser

Hello Jenkins community, I am a user of Jenkins, who install jenkins through 'sudo apt-get install jenkins' on a Ubuntu Machine. Recently, I updated the jenkins and found the jenkins never be able to show up on browser. By checking the last 30 lines of log from "/vars/log/jenkins/jenkins.log":

Jenkins is fully up and running but not accessible on browser

on #1 from /128.93.102.86 :50505 You can see the Jenkins is fully up and running, but when I visit localhost:8080, it shows "This site can’t be reached" I did see the waiting pages and it asks waiting jenkins is ready to reload the page. But it never happens. If I reload manually, I got the