How can I change the screen resolution?

[coolnine98]

I am getting this error:

pine64user@debianpine64:~$ sudo apt-get install sunxi-disp-tool
[sudo] password for pine64user:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package sunxi-disp-tool
pine64user@debianpine64:~$

My display is set to 1080p at 0 hz and I like to change to 1080p 60hz or 720p. I don get any option about "optargs=disp.screen0_output_mode=720p60  <== changed this to 1080" under sudo nano /boot/uEnv.txt.

ALso,when I open uEnvi.txt file I am getting following:

console=tty0 console=ttyS0,115200n8 no_console_suspend
kernel_filename=pine64/Image
initrd_filename=initrd.img
ethaddr=7a:6e:63:ac:21:f1




How do I resolve this error?

Thanks