Daniel Cunha's questions

So I just installed forge for 1.7.10 and 1.12.2 AND optifine for 1.14, but every time I try to launch minecraft it gives out this error:

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Exception in thread "main" 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')
    at net.minecraft.launchwrapper.Launch.<init>(Launch.java:34)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

When I turn on my computer, it goes into the Ubuntu interface and asks me what I want to boot into:

Ubuntu
Advanced system options for ubuntu 
Windows boot manager (on /dev/sda1)
System setup

When I boot into the “Ubuntu” option, it just shows a command prompt that runs a few commands:

[   3.075355] sd 4:0:0:0 [sdb] No Caching Mode page found 

[   3.075388] sd 4:0:0:0 [sbd] Assuming Drive cache: write through

/dev/sdb2 contains a file system with errors, check forced

  Inode 2766781 extend tree (at level 2) could be narrower. IGNORED.

Inode 3938804, end of extent exceeds allowed value

 (Logical Block 387, physical block 19229549, Len 1)

/dev/sbd2: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.

(i.e., without -a or -p options)

fsck exited with status code 4

The root filesystem on dev/svb2 requires a manual fsck
BusyBox v1.27.2 (Ubuntu 1:1.27.2-2ubuntu3.2) built-in shell (ash)

Enter ‘help’ for a list of built in commands.
(initramfs)

This is my only computer and I don’t know much about Linux.

Thanks for your time!