What is the difference between update and upgrade in Ubuntu?

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Tags

1. #install
2. #about
3. #package
4. #upgrade
5. #lists
6. #versions
7. #manager
8. #update
9. #newer
10. #installs
11. #available
12. #packages
13. #actually
14. #updating
15. #knows
16. #updates
17. #after
18. #their
19. #installed
20. #software