# Validation failed at 99% while flashing Ubuntu Server 21.10 (32bit).img on Win 10 64bit OS

**URL:** <https://forums.balena.io/t/validation-failed-at-99-while-flashing-ubuntu-server-21-10-32bit-img-on-win-10-64bit-os/352643>\
**Category:** balenaEtcher\
**Created:** [February 16, 2022, 11:51am UTC](https://forums.balena.io/t/validation-failed-at-99-while-flashing-ubuntu-server-21-10-32bit-img-on-win-10-64bit-os/352643 "2022-02-16T11:51:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![michal\_roesler](https://avatars.discourse-cdn.com/v4/letter/m/9d8465/32.png) [@michal\_roesler](https://forums.balena.io/u/michal_roesler)\
**Post date:** [February 16, 2022, 11:51am UTC](https://forums.balena.io/t/validation-failed-at-99-while-flashing-ubuntu-server-21-10-32bit-img-on-win-10-64bit-os/352643/1 "2022-02-16T11:51:47Z")

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The problem is as described in the topic.  
The flashing was made without any issues.  
I was carefully observing the whole flashing process and saw nothing disturbing.  
And the problem at validation is at 99% - it’s written “flash failed” without any error code.

I suspect the whole flashing process was successful. I just don’t know why it shows “flash failed” only at 99%. The SD card being flashed is 256Gb Sandisk Extreme PRO, V30.  
The BalenaEtcher version I’m running = 1.7.3 portable;  
The operating system I’m running Etcher in = Windows PRO 64bit;  
Windows Disk Management shows “no media” after SD card being flashed, but I’ve read [this post](https://www.balena.io/blog/did-etcher-break-my-usb-sd-card/) on your blog, so I’m cool about it.

I have 3 SD cards of that model, and flashing/validation failed on all of them at 99% validation.

[balenaEtcher verification failed at 99 percent.log](https://forums.balena.io/uploads/short-url/b7Jip3fEe5rF2K0GZl17ozj2E4S.log) (50.8 KB)

On the positive side of things I was able to successfully flash Raspberry Pi OS to my Samsung USB stick the day before. Also from computer with Windows PRO 64bit.

Is there any way I can manually check if the flashing was completed successfully?  
A simple link to the process of manual verification would be fine.

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<div class="post-metadata">

**Author:** ![zwhitchcox](https://avatars.discourse-cdn.com/v4/letter/z/8e7dd6/32.png) [@zwhitchcox](https://forums.balena.io/u/zwhitchcox)\
**Post date:** [April 18, 2022, 9:31pm UTC](https://forums.balena.io/t/validation-failed-at-99-while-flashing-ubuntu-server-21-10-32bit-img-on-win-10-64bit-os/352643/2 "2022-04-18T21:31:45Z")

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Hi, unfortunately there’s really no way to manually verify the disk other than just trying to use it. Unix machines all run `e2fsck` before starting up, so there should be an error in the logs if the file system is corrupted.

Regarding the verification failure, I see in the logs it says:

```auto
"Error: certificate has expired\n at TLSSocket.onConnectSecure (_tls_wrap.js:1497:34)\n at TLSSocket.emit (events.js:315:20)\n at TLSSocket._finishInit (_tls_wrap.js:932:8)\n at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:706:12)","config":{"url":"https://balena.io/etcher/static/config.json","method":"get","headers":{"Accept":"application/json, text/plain, */*","User-Agent":"axios/1.7.3"},"transformRequest":[null],"transformResponse":[null],"timeout":0,"responseType":"json","xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","maxContentLength":-1,"maxBodyLength":-1,"transitional":

```

Which I have seen in a previous ticket regarding verification errors, so I’m thinking they might be related, although I will have to test this to be sure. It looks like the write was actually successful though. Can you try the the flashed disk and run `journalctl -a | grep e2fsck` and share the output?