When installing Ubuntu next to Windows10, I changed the file system to linux, is this cured?

Question

ubuntu

When installing from a flash drive, Ubuntu messed up with partitions. I did not immediately understand that more than 4 main ones cannot be done. And when I understood, I combined C and D, then compressed, cut off 20 gigs as advised, made 3 sections, all according to the instructions, it turned out that 6-7 gigs were needed for the process to go. Here everything did not go according to plan, I crashed disk C again, then everything was in a fog)) I
changed the boot order in boot. Here windows and flew off possibly.
As a result, Ubuntu stands, everything is ok, on the second attempt it's true. knocked out errors. I had to reinstall, with the removal of the previous installation.
As a result, the command sudo badblocks -v /dev/sd*
Invalid last block - /dev/sda1

A sudo fdisk -l
Gives 8pcs /dev/loop
AND
/Dev/sda1 type efi
/Dev/sda2 type Linux file system

So far, search engines and forums have not helped. Is it curable?
If anyone can help the teapot, I will be grateful.