query: Cannot revert back to Ubuntu 13.04
positive_passages.docid: 23482
positive_passages.text: How to remove all traces of KDE installed
negative_passages.docid: 37440
negative_passages.text: How to reinstall Ubuntu 13.04 Raring Ringtail safely?
negative_passages.docid: 7357
negative_passages.text: upgrade to 13.10 stalled and restart failed
negative_passages.docid: 1687
negative_passages.text: How to revert software sources back to default?
negative_passages.docid: 36529
negative_passages.text: How to revert an update?
negative_passages.docid: 54596
negative_passages.text: I run `sudo apt-get remove python2.7`, can I restore my Ubuntu now?
negative_passages.docid: 149437
negative_passages.text: Ubuntu equivalent of system restore? Does it exist?
negative_passages.docid: 12578
negative_passages.text: How do I upgrade to a newer version of Ubuntu?
negative_passages.docid: 140231
negative_passages.text: How to get back sudo on Ubuntu?
negative_passages.docid: 94372
negative_passages.text: "Back" and "Install Now" buttons grayed out in 14.04 installer
negative_passages.docid: 7521
negative_passages.text: Revert Android Update 4.0 to 3.0/3.2
negative_passages.docid: 143747
negative_passages.text: How do I enable the "backports" repository?
negative_passages.docid: 23292
negative_passages.text: Resetting Ubuntu to factory settings
negative_passages.docid: 94446
negative_passages.text: Revert to upstart
negative_passages.docid: 63176
negative_passages.text: How can I update to Ubuntu 21.04?
negative_passages.docid: 76279
negative_passages.text: How do I move back to original directory?
negative_passages.docid: 54710
negative_passages.text: How can I re install the APT Tool?