First boot

[Computerring123]

Is everything ok altough when i expanded filesystem there was warning typed in red :

Re-reading the partition table failed.: Device or resource busy

[fruitoftheloom]

Is everything ok altough when i expanded filesystem there was warning typed in red :

Re-reading the partition table failed.: Device or resource busy

It would appear from you other unresolved posts scattered around this forum

search.php?author_id=169296&sr=posts

...that you have an issue with corruption of the data on the SD Card.

Maybe it would be prudent to go shopping tomorrow for a brand new SD Card

[rpdom]

Is everything ok altough when i expanded filesystem there was warning typed in red :

Re-reading the partition table failed.: Device or resource busy

Yes, that message is normal and can be ignored in this case.
The next line (or so) says something like "Changes will be active from next reboot" or close to that. That is why you need to reboot for the next stage.

[Computerring123]

this is what it showed.

Command (m for help): The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Device or resource busy (typed in red)

The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).

[rpdom]

Yes, that's ok. It's really a warning message, rather than an error. Actually, more of a reminder that you need to do something more (the reboot).

As it says, the kernel (Linux) is still using the old table at that point, because it can't handle a change in the layout of the disk while it is running.

When you reboot it reads the new table that has been written and completes the resize operation.

It's a pity that message couldn't be hidden in this case, to prevent people getting unduly worried by it.

[QuietZone]

Or, following the Windows tradition, a message box should pop up at this point saying that your system needs to be rebooted (right now!).

And, in keeping with modern Windows trends, there should be two clickable options here:

1. Yes (or OK)
2. Yes (or OK)

I rue the day when Windows just goes ahead and reboots - why prompt the user at all?
That day can't be far away.