I've accidentally typed wrong number : dd if=/dev/urandom of=/dev/sda2 which is my extended parition where I've suse installed and I wanna install encrypted LMDE(I also have a /dev/sda1 which is data partition). COmmand line outputed that it wirtes only 1kb so it looks like all the parititons should be there unchanged only the partition table(begginging of part) of the extended partition is bad/destroyed. Gparted says that it's libparted bug(wrong signature 7c58) which apparently isn't but it interpreted it that way. And I didin't installed suse to MBR so there is no way to recover it I just need new one. So my question how to manully create partition table and where to place it (I assume that at the beggining of the sda2 partition)

I know nothing about libparted. What do the following commands state?

The extended partition that you think you destroyed, what partitions were on there before?

If you're just looking for another fdisk tool to use, there's fdisk, sfdisk, and cfdisk for MBR partitions; gdisk for GPT partitions, maybe more tools. Partition reconstruction is hard unless you know exactly where your partitions used to start. As a safeguard, I do something like this:

Then I either move that sda-partitions file somewhere else or print it out, in case I make the same mistake you made. [FWIW, I have made this very mistake.]

Logical partitions are a linked-list - they are not addressed via a (single) partition table like primary partitions.
Over-writing with random data will certainly have obliterated the "disk signature" for the first logical partition. Testdisk may find the logicals for you and correct the signature - although determining the first logical may be beyond it. Whether the filesystem is usable is a different question - again testdisk may work for you.
Or not.

Restoring from your backup is the best recovery.

thanks guys for advice, especially for that fdisk > ...command it can avoid a lot of pain. And about that backup - I use btrfs, but I learned that once a week you should copy the snapshot to some external drive such as usb...