Fix Cydia Repo Errors

1. Go to /etc/apt/sources.list.d/
2. Open "cydia.list" etc.
3. Look for the sources causing the problem and delete or comment it out.
4. Open Cydia and you'll see.

http://www.jailbreaknews.com/how-to-fix-cydia-repo-errors-using-your-idevicve-or-computer/

【from Cydia】Recommends after jailbreak

Disclaimer: I will NOT be responsible for any trouble/problems you get into! TRY AT YOUR OWN RISK!

◇Cydia original

★Mobile Substrate (Code insertion platform)
★MobileTerminal (Terminal emulator)
★OpenSSH (SSH access)
★file:// for MobileSafari (Browse local files)
☆Five Icon Dock (Allow fifth icon on dock)

◇BigBoss

★Aptbackup (Cydia app backup&restore tool)/private/var/mobile/Library/Preferences
★BiggBoss Recommend.. (Useful tools package)
★BossPrefs (Customize springboard)
★SBSettings (Display toggles)
★sbsettingstoggles (Toggles)
★Rotation Inhibitor (Rotation toggle)
★Airlplane SBSettings (Airplane SBS toggle)
★Backgrounder (Enable&manage backgrounding)
★Kirikae (Task switcher)
★Activator (Activate apps via gesture&buttons)
★ActionMenu (Extensible Action Menu)
★iKeyEx 3 (Keyboard manager)
★CyDelete (Delete Cydia Apps)
☆iSHSHit (SHSH save&send tool)
☆ABGrouper
☆aDownloader
☆BossPaper (Customizable wallpaper.app)
△AddCallHistory (Add fake call history)

◇ModMyi

☆dTunes (alternative player&downloader)

◇Moyashi

☆StatusBarCustomClock (Customize statusbar clock)
☆SBCCScript (additional script for StatusBarCustomClock)

◇Hackulo.us

★AppSync for OS X.X (Sync cracked apps with iTunes)
★Hackulous Security (Secure malware&antiphishing)
★Installous (Install ipa)

◇SiNful iPhone

★3G Unrestrictor Cracked (Make apps think they are on WiFi)
★biteSMS Cracked (SMS app with QuickCompose&Reply)
★RecentCallLogDelete (Manage Call history)
★iFile Cracked (Manage files)
☆Cyntact Cracked (Profile picture in contacts)
☆LockInfo Cracked (Display alerts&notifies on LockScreen)
☆MyProfiles Cracked (Create&manage profiles)