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after a sudo apt-get upgrade I was told that some packages could be safely removed. I guess these were old kernels, so I did

sudo apt-get autoremove

but now the system won't start anymore and just says Missing Operating System.

The computer unfortunately doesn't have a CD drive for a Live CD. I guess I could boot from a USB stick, but what exactly would I then do for a recovery?

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Method 1: Per Super Grub Disk

You can start Super Grub Disk via USB

Methode 2:

First you need a Live-CD/USB. Start the Live-CD and open a new terminal. First mount the Ubuntu-System (boot-partition):

sudo mount /dev/sda2 /mnt 

Here an example for sda2.

Now install GRUB

sudo grub-install --root-directory=/mnt /dev/sda 
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