[Failure writing LeadIn; Reason: Unknown]

I just downloaded ImgBurn today, and also went and bought 5 DVD+R Dual Layer disks just so I could burn my Ubuntu x64 iso, but alas, I have a problem at the bottom...

I 14:01:25 Average Write Rate: N/A - Maximum Write Rate: N/A
W 14:01:44 User accepted disc space warning and is attempting to underburn!
I 14:01:45 Operation Started!
I 14:01:45 Source File: C:\Users\Erin Lynch\Desktop\ubuntu-12.10-desktop-amd64.iso
I 14:01:45 Source File Sectors: 390,656 (MODE1/2048)
I 14:01:45 Source File Size: 800,063,488 bytes
I 14:01:45 Source File Volume Identifier: Ubuntu 12.10 amd
I 14:01:45 Source File File System(s): ISO9660 (Bootable), Joliet
I 14:01:45 Destination Device: [0:0:0] 16X8 DVD DUAL A04b (D:) (ATA)
I 14:01:45 Destination Media Type: DVD+R DL (Disc ID: CMC MAG-D03-64)
I 14:01:45 Destination Media Supported Write Speeds: 4x
I 14:01:45 Destination Media Sectors: 4,173,824
I 14:01:45 Destination Media L0 Data Zone Capacity: 2,086,912 (Changeable: Yes)
I 14:01:45 Write Mode: DVD
I 14:01:45 Write Type: DAO
I 14:01:45 Write Speed: MAX
I 14:01:45 DVD+R DL Reserve Track: No
I 14:01:45 Link Size: Auto
I 14:01:45 Lock Volume: Yes
I 14:01:45 Test Mode: No
I 14:01:45 OPC: No
I 14:01:45 BURN-Proof: Enabled
I 14:01:45 Write Speed Successfully Set! - Effective: 5,540 KB/s (4x)
W 14:01:52 Optimal layer break position is such that all data will be written on L0.
W 14:01:52 Image Size: 390,656
W 14:01:52 Optimal L0 Sectors: 390,656
I 14:01:52 Optimal L0 Data Zone Capacity: 390,656
I 14:01:52 Optimal L0 Data Zone Method: None
I 14:01:53 L0 Data Zone Capacity - Effective: 2,086,912
I 14:01:53 Filling Buffer... (80 MiB)
I 14:01:54 Writing LeadIn...
W 14:02:28 Failed to Write Sectors 0 - 31 - Reason: Unknown (ASC: 0x91, ASCQ: 0xC1)
W 14:02:28 Retrying (1 of 20)...
W 14:03:00 Retry Failed - Reason: Unknown (ASC: 0x91, ASCQ: 0xC1)
W 14:03:00 Retrying (2 of 20)...
W 14:03:30 Retry Failed - Reason: Unknown (ASC: 0x91, ASCQ: 0xC1)
W 14:03:30 Retrying (3 of 20)...
W 14:04:02 Retry Failed - Reason: Unknown (ASC: 0x91, ASCQ: 0xC1)
W 14:04:02 Retrying (4 of 20)...

I also tried two other image burning softwares, and neither of those worked either. All I get is "Cannot write ISO file to DVD" or something like that. I have no clue what the LeadIn is for, or what it even is? What is wrong?