Okay. So most likely the history file becoming inaccessible was not caused by a bug or misfeature in nano, but by the same cause that made your Ubuntu install stop working. Closing this as invalid as there is no way to verify anything any more.
** Changed in: nano (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to nano in Ubuntu. https://bugs.launchpad.net/bugs/1535478 Title: Nano search History destroyed Status in nano package in Ubuntu: Invalid Bug description: nano gives result: Error reading /home/sand/.nano/search_history: Permission denied Press Enter to continue sudo nano gives result: Error reading /home/sand/.nano/search_history: Permission denied Press Enter to continue ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: nano 2.4.2-1 ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6 Uname: Linux 4.2.0-19-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.19.2-0ubuntu6 Architecture: amd64 CurrentDesktop: Unity Date: Mon Jan 18 18:21:07 2016 InstallationDate: Installed on 2015-11-23 (56 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) SourcePackage: nano UpgradeStatus: Upgraded to xenial on 2015-11-25 (54 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1535478/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp