Kali persistence stuck in boot time

[blackronin]

Hello

My kali usb persistence is stucking on boot ( i see only black screen with cursor)

I saw that usb is out of free space, i need delete some cache from apt-get.

Problem is that i do not how to mount that usb.

(I have Luks encryption enabled)

From centos i see that thae file system is read-only.

So i tried
mount -t ext4 -o remount,rw /dev/sdb /media/
but i get
mount: /dev/sdb allready mounted or bad option.

I don't know what to do , with this luks :(

Pls help

[blackronin]

Ok, that helped
http://evilshit.wordpress.com/2012/10/29/how-to-mount-luks-encrypted-partitions-manually/

But cleaning apt cachge files didn't helped.
The partition is not out of space anymore (have over 300mb free space)

But kali still freezes during booting