Error at instaling FTB on Ubuntu.

[danielcamino]

I'm installing FTB on Ubuntu and I'm getting this error:

No usable authlib available. Please check your firewall rules and network connection. Can't start MC without working authlib. Launch button will be disabled

Unhandled exception in Thread[AWT-EventQueue-0,6,main]: java.lang.NoClassDefFoundError: net/ftb/gui/MigrationNotifier

Any clue?

AnalyticsBackgroundThread started
FTBLaunch starting up (version 1.5.1 Build: 10501)
OS: Linux 5.4.0-48-generic (64-bit)
Launcher Install Dir: /home/daniel/Games/ftb
System memory: 57470M free, 64311M total
Using Java path entered by user: /usr/lib/jvm/java-8-openjdk-amd64/bin/java
[i18n] Fallback enUS loaded
[i18n] esES Cargado el idioma Español!
Checking installation location
Balance has selected Automatic:CreeperRepo
Using download server Automatic:UNKNOWN on host UNKNOWN (89.187.169.37)
Loading user data
Creating Console window
Creating main window
Local Authlib Version is good, skipping Download
Adding Authlib to Classpath
class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap'): java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
From Console: java.lang.NullPointerException
From Console: at java.base/java.io.Reader.<init>(Reader.java:167)
From Console: at java.base/java.io.InputStreamReader.<init>(InputStreamReader.java:72)
From Console: at net.ftb.util.OSUtils.makeStyleSheet(OSUtils.java:606)
From Console: at net.ftb.gui.panes.NewsPane$1.<init>(NewsPane.java:41)
From Console: at net.ftb.gui.panes.NewsPane.<init>(NewsPane.java:39)
From Console: at net.ftb.gui.LaunchFrame.<init>(LaunchFrame.java:355)
From Console: at net.ftb.main.Main$8.run(Main.java:404)
From Console: at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:303)
From Console: at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
From Console: at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
From Console: at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
From Console: at java.base/java.security.AccessController.doPrivileged(Native Method)
From Console: at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
From Console: at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
From Console: at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
From Console: at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
From Console: at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
From Console: at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
From Console: at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
From Console: at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Loading modpack information for modpacks.xml...
Loading modpack information for thirdparty.xml...
[i18n] Added 0 enUS to options pane
[i18n] Added 1 cyGB to options pane
[i18n] Added 2 daDK to options pane
[i18n] Added 3 deDE to options pane
[i18n] Added 4 enGB to options pane
[i18n] Added 5 enUS to options pane
[i18n] Added 6 esES to options pane
[i18n] Added 7 fiFI to options pane
[i18n] Added 8 frCA to options pane
[i18n] Added 9 frFR to options pane
[i18n] Added 10 jaJP to options pane
[i18n] Added 11 itIT to options pane
[i18n] Added 12 maHU to options pane
[i18n] Added 13 nlNL to options pane
[i18n] Added 14 noNO to options pane
[i18n] Added 15 plPL to options pane
[i18n] Added 16 ptBR to options pane
[i18n] Added 17 ptPT to options pane
[i18n] Added 18 ruRU to options pane
[i18n] Added 19 svSE to options pane
[i18n] Added 20 zhCN to options pane
[i18n] Added 21 zhTW to options pane
[i18n] esES Cargado el idioma Español!
loading map information...
loading texture pack information...
Setting up Launcher
Downloading pack data
No usable authlib available. Please check your firewall rules and network connection. Can't start MC without working authlib. Launch button will be disabled.
Opening main window
Unhandled exception in Thread[AWT-EventQueue-0,6,main]: java.lang.NoClassDefFoundError: net/ftb/gui/MigrationNotifier
Adding map 1 (FTB Trident Default Map)
Adding map 2 (Agrarian Skies Default Map)
Adding map 3 (Agrarian Skies Flat Map)
Adding map 4 (Agrarian Skies Server Map)
Adding map 5 (Direwolf20 Map Ep.0)
Adding map 6 (FTB Pax Challenge)
Adding map 7 (Direwolf20 Map Ep.0)
Adding map 8 (Direwolf20 Map Ep.10)
Adding map 9 (Direwolf20 Map Ep.20)
Adding map 10 (Direwolf20 Map Ep.30)
Adding map 11 (Direwolf20 Map Ep.40)
Adding map 12 (Direwolf20 Map Ep.50)
Adding map 13 (Direwolf20 Map Ep.80)
Adding map 14 (FTB Normal)
Adding map 15 (FTB Insanity)
Adding texture pack 1 (Soartex Fanver)
Adding texture pack 2 (Jadedcat Mixpack)
Adding texture pack 3 (Invictus)
Adding texture pack 4 (Faithful)
Adding texture pack 5 (JohnSmith Technicians Remix)
Adding texture pack 6 (Familiar yet Different)

 

[danielcamino]

I'm closing the tread because I find that I use an old .jar installer.
New .sh from FTB webpage it's working perfectly!