VBox Guest Additions won't install completely

However, after going into low-graphics mode, it asks if I want to try starting the X server again, and when I say yes, it works, but the additions (eg, support for actually filling the screen and mouse integration) still don't work.

Hi kleinb1,

Please attach the output of `lspci -vvnn`, and attach your /var/log/Xorg.0.log (and maybe Xorg.0.log.old) file from after reproducing this issue. If you've made any customizations to your /etc/X11/xorg.conf please attach that as well.

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Xorg.0.log is attached. I have not made any customizations to /etc/X11/xorg.conf, and the result of lspci-vvnn is
00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC [Natoma] [8086:1237] (rev 02)
 Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] [8086:7000]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0

00:01.1 IDE interface [0101]: Intel Corporation 82371AB/EB/MB PIIX4 IDE [8086:7111] (rev 01) (prog-if 8a [Master SecP PriP])
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 64
 Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
 Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1]
 Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
 Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
 Region 4: I/O ports at c000 [size=16]
 Kernel driver in use: ata_piix

00:02.0 VGA compatible controller [0300]: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter [80ee:beef]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Region 0: Memory at e0000000 (32-bit, prefetchable) [size=8M]

00:03.0 Ethernet controller [0200]: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] [1022:2000] (rev 40)
 Subsystem: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] [1022:2000]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 64 (1500ns min, 63750ns max)
 Interrupt: pin A routed to IRQ 11
 Region 0: I/O ports at c020 [size=32]
 Region 1: Memory at f0000000 (32-bit, non-prefetchable) [size=4K]
 Region 2: Memory at f0080000 (32-bit, non-prefetchable) [size=512K]
 Kernel driver in use: pcnet32
 Kernel modules: pcnet32

00:04.0 System peripheral [0880]: InnoTek Systemberatung GmbH VirtualBox Guest Service [80ee:cafe]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 10
 Region 0: I/O ports at c040 [size=32]
 Region 1: Memory at f0400000 (32-bit, non-prefetchable) [size=4M]
 Kernel modules: vboxadd

00:07.0 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI [8086:7113] (rev 08)
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B...

Hmm, I'm wondering if this is a vbox bug rather than xorg specifically, but not sure...

I don't think that this is a vbox bug because the additions are working just fine under 8.10.

This is because the actual xorg server version is 1.6.0 and into the script installation of the addition the only xorg version supported is 1.6

So to resolve this tiny problem all you have to do is to edit the install.sh file, go to the line 415 and change 1.6 by 1.6.0 than execute : sudo ./install.sh

Which directory is this file in?

Sorry : i forgot to mention-it

you have to uncompress the guestadditions

./VBoxLinuxAdditions-x86.run --target ~/tmp
(~/tmp is a target that you can change)
next in this target you'll find the install.sh file to edit

you have tio edit like i mentioned it

and next apply it :
sudo ./install.sh

Um, ... my install.sh does not have "1.6" in it at all. Any reason?

certainly not a bug in xorg, you need to file this to vbox upstream.