Hello @EnforcerZhukov, as you say, the issue with corrupt updates on NTFS is being tracked at #4800. It is not fixed, but there is a workaround in that issue report. We'll only track the EXT4 update issue here.
I have the same issue, installed cs:go on an ext4 partition. But I also have a ntfs steam library, and for some reason steam decided to download updates for cs:go on the ntfs partition.
How much free space is available on the ext4 steam library? Per "Steam will now use library folders on other drives to download game updates if the primary drive doesn't have enough space left" in the 2017-08-29 stean client update, it would not be surprising if steam is picking the NTFS steam library to stage the game update.
I have over 6GiB available on the steam library partition and the update was only 30MiB so for this update that wasn't the case.
In my case, 47GiB on /home and 200GiB on the NTFS. I attach a screenshot of the libraries:

same issue...
I have one library folder in NTFS and another in EXT4
probably steam is using the first one to update an application that is in EXT4 partition.
This makes imposible to update csgo and dota2.
You can workaround umounting and mounting again with uid=1000 as said before.
sudo umount "/mnt/MEDIA/Juegos Steam"
sudo mount "/mnt/MEDIA/Juegos Steam" -o rw,uid=1000,gid=1000
this can allow to workaround temporary if you don't want to use fstab to make it persistent.
be sure that your uid and gid is 1000 with the command
id
Just in case tried removing the NTFS library from Steam settings, downloaded the game again, and I'm having the same error. I'll try later unmounting all the NTFS mountpoints.
This is happening with Counter Strike, Dota 2 and Team Fortress 2 on NTFS and EXT4 every time there is an update.
Having this issue as well.
I have a Secondary NTFS partition (Share Drive) on a drive that I mount in Windows and Linux.
Some games install, other games say Corrupt Update Files. For the games that do install on the Share Drive, Proton does not work.
Once a game is installed on the Share Drive, I cannot move the install drive from Steam GUI because it says that the game "already exists" on that drive, even though the Steam Library View says that drive has zero game installs.
Hello, is anyone still experiencing this issue on an up to date system? It should have been resolved along with https://github.com/ValveSoftware/steam-for-linux/issues/4800#issuecomment-487698302.
@kisak-valve I havent experienced this bug since 2017.
I just put the fix in my fstab and mounted my ntfs partition as I did back then.
I cant retest because I cant reproduce the bug anymore.
Thanks for the feedback @mercuriete, closing as fixed some time ago.
Your system information
Please describe your issue in as much detail as possible:
I install CS:GO from Steam, and when it reaches the end of the download/installing process, shows the Corrup
The same error is given if I verify data integrity or re-download the game. Tried installing on a NTFS drive, as well as the /home drive (ext4). As I see, the problem was theorically fixed, but I'm still having the same issue (https://github.com/ValveSoftware/steam-for-linux/issues/4800)
I attach a screenshot showing the file that is supposed to raise the error - that alert box is only shown when I press on Play the game, then wait until it finishes re-downloading everything and when it tries to launch it, the dialog is summoned.

I have previously installed Verdun and Left 4 Dead 2 (on /home) without problems, working well actually.
Steps for reproducing this issue: