Installation on macbook pro

On my macbook pro (late 2011), im trying to install clear linux along side linux mint(no mac os on this system). After install, when i reboot it is giving an error

Error: unknow filesystem grub rescue>
What should i do.

And there is no wifi also when im on live usb.
Output when i run lspci -nn -d 14e4: command
02:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme BCM57765 Gigabit Ethernet PCIe [14e4:16b4] (rev 10) 02:00.1 SD Host controller [0805]: Broadcom Inc. and subsidiaries BCM57765/57785 SDXC/MMC Card Reader [14e4:16bc] (rev 10) 03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4331 802.11a/b/g/n [14e4:4331] (rev 02)

The wifi driver on several macbook models is unfortunately not supported by OSS drivers. The only real way around it is to use a USB ethernet stick during installation.

Grub errors, well, that’s a bug in the installer. At a minimum it should have left you with a bootable clearlinux.

Please note that in some cases we do ship an open driver, but you may need proprietary firmware that we can’t ship (b43 for instance). You could, in those cases, manually install the firmware to solve the problem.