I installed the new kernel which fixed a mouse issue, but now I do not have full screen anymore. I am trying to get guest additions to work again but I am getting this error:

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I think your system is missing a kernel module needed to mount iso file system....the module is isofs.ko and it is dependent on module nls_base.ko.... you can check the dependency using depmod. Once you have verified the missing modules, insert them using insmod Check this link

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