Integrity: Problem loading X.509 certificate -65

Solution 1:

I had the EXACT same problem! At the end of the story, after several failed attempts to install Ubuntu on my machine, I started to suspect the HDD (which was very unpleasant, since I had just bought the PC). In the end, the problem was actually the HDD.

To run disk tests on your HDD, boot to a virtual Ubuntu machine and open the terminal.

To discover the path of your Linux partition, type:

sudo fdisk -l

The output should contain something like this:

Device         Start       End   Sectors   Size Type 
/dev/sdb1       34        32767      32734    16M Microsoft reserved
/dev/sdb2      32767 1025777663 1025744896 489,1G Microsoft basic data
/dev/sdb3 1025777663 1026828287    1050624   513G EFI System
/dev/sdb4 1026828287 1953523711  926695424 441.9G Linux filesystem

The partition that is giving problems, in my case, is the /dev/sdb4.

Then run:

sudo badblocks -sv /dev/sdb

And wait to see if there is errors in your partition. If yes, now you know what is causing the problem.

After this, run:

sudo fdck /dev/sdb4

If you notice an error in your HDD, you should change it as soon as possible. Hope this helps!

Solution 2:

I fixed this message into my laptop BIOS. All you need to do is :

1. Disable the Secure Boot

2. Reset Setup Mode ( this function is in Bios )

After that, just exit Bios and save changes.

Solution 3:

This issue comes in some Acer laptops as its BIOS contains two obsolete certificates. The error message is harmless and can be ignored. Some patch is available for Linux kernel to hide this error, but its not part of Ubuntu yet. I have filed a launchpad bug at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1930783.