I've installed Parrot OS lately and I've received such a problem with GRUB:

error: file '/grub/i386-pc/normal.mod' not found.
grub rescue>

I am struggling with this issue for whole day and nothing.
I have already reinstalled system couple of times, removed/resized EFI
partition, googled the subject and tried various of methods but still nothing
works for me.

So that's my problem below and my attempts to fix it:

https://imgur.com/a/DwvnR

And that's what fdisk -l showed me:

https://imgur.com/a/m2JYZ

If someone had the same problem and fixed it somehow, please help me, cause I
need my laptop to work and all I can do now is booting system from live CD.
Thank you in advance.

Your fdisk output shows that you have an EFI partition (sda6) on a logical partition and I believe it needs to be on a primary. Actually, you have a legacy/MBR system with windows also installed. You should not try to install your LInux system EFI on this system. Which windows do you have? Mixing MBR and EFI installs is going to be problematic to say the least.

I have two primary partitions dedicated for windows 7, but i cannot make third one, cause it is impossible to make logical partitions then.

You have a Legacy/MBR install of windows which was standard for windows 7. You have 3 windows (ntfs) partitions, sda1 2 and 4. sda3 is a logical partition and sda5,6 and 7 are logical partitions within the Extended, sda3. Your problem is that you have tried to do an EFI install of Parrot OS on a Legacy/MBR system. Don't do that. You don't need or want an EFI partition.

Go into the BIOS and make sure Legacy boot is enabled and EFI is disabled. I'm not familiar with Parrot so you might check their website for documentation.

My understanding is that with EFI, you need the EFI partition on a primary partition in vfat format marked as bootable/active. You can't do this with your current setup without deleting one of your windows partitions. Do a Legacy install.

The problem is I cannot instal OS without having a EFI partition. Partition manager just does not allow me to do it.
I have only two boot options in my BIOS settings - UEFI Boot and PXE ROM. Both didn't get me anywhere.
I thought about deinstalling windows and to leave only linux but I have a lack of knowledge if it could not make some bigger problems.

The link below is a very detailed tutorial on installing Parrot OS as an MBR/Legacy system which does not require an EFI partition.

https://www.tecmint.com/parrot-secur...and-anonymity/

You might post some information on your hardware like the computer manufacturer and maybe someone familiar with it will have some advice. It would be pretty abnormal to not have a Legacy option but not knowing your hardware??

Try this: https://unix.stackexchange.com/quest...-mod-not-found