errno 28 no space left on device

hi, i am useing ubuntu 18.04.02 in VMware virtual computer .when i try to log in admin panel with web browser i write the correct password but can not log in and does not give wrong password error.... just can not log in. and when i check ubuntu, I saw this warning " => / is using 99.5% of 3.38GB" than I upgraded to 10 GB but still giving the same warning and can not log in. what can i do... please help me

Is it necessary that you have to expand the filesystem now?

Expand Filesystem

If you have installed Raspbian using NOOBS, the filesystem will have been expanded automatically. There may be a rare occasion where this is not the case, e.g. if you have copied a smaller SD card onto a larger one. In this case, you should use this option to expand your installation to fill the whole SD card, giving you more space to use for files. You will need to reboot the Raspberry Pi to make this available. Note that there is no confirmation: selecting the option begins the partition expansion immediately.
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