unable to login to tty7 on LMDE XFCE on VBOX

[lahirdenganselamat]

I installed LMDE XFCE 64bit 201109 as guest on VirtualBox 4.1.8 with Mint 11 32bit as host OS. Installation process was smooth, then I restart the VM, installing vbox guest addition, then restart.
after that, I do an upgrade using apt-get upgrade, and upgrade ~690 package (took 2 hour to be finished). After restart, instead of login to tty7, i got to tty1 screen.
Typing startx from tty1 resulting no screen found. then I go to Xchat and got suggestion from AlbertP to run

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sudo service lightdm start

then I realize that I never see words like lightdm on my upgrade process so I type

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sudo service gdm3 start

resulting gdm3:failed
sudo service gdm3 status says that gdm3 already running. I can go to tty7 by pressing Alt+F7, but I cannot see anything instead of " _ " on the top lest of the screen.

Is there any way to me to be able to login to tty7?? ( I mean to be able to use xfce again, not CLI)

[lahirdenganselamat]

I try to do an upgrade but it seems that LMDE cannot connect to the internet (the host OS was connected). So is there anybody suggests to do an upgrade, it seems that I cannot do that on my LMDE