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I can't expand the Debian-partition

Hi all.
After copying a bulk files I felt the limitation of Debian-partition, and decided expand it, as a space on disk was. The partitions on disk placed so: sda2-Debian, sda3-swap.  I deleted the sda3-swap, and expand sda2-Debian, and create swap again.  I used "parted" with terminal. After all 'parted' and 'fdisk' are seeing increasing sda2-Debian and sda3-swap, but graphical file manager 'Thunar' don't seeing increasing sda2-Debian (i.e. its status-bar expose Free space: 733,9 MB) the size was before all changes .Besides this in the booting time are doing the check of disk, duration is 2 min.If I execute:

-------/home/user# fdisk /dev/sda------ 

there appear: 

---------Changes will remain in memory only, until you decide to write them.
Be careful before using the write command------

But after attempts executes  command  write: 

-----------Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Device or resource busy.
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)---------
I don't know what may do. Give me any advices, please.