Re: Big problem computer not booting

[Fungi4All <fungilife@protonmail.com>]

From: field.engineer@gmail.com

To: debian-user@lists.debian.org

On 08/10/2017 12:00 PM, kelsang sherab wrote:

> I run Debian stretch on MacBook Air

>

> I did a restore backup from previous system[debian Jessie ]

>

> Now machine is not booting

>

> upon boot the machine gives the normal GRUB menu:

> Debian GNU/Linux

> Advanced options for Debian GNU/linux

>

> Click the 1st one

>

> saying

> Loading etc

> Loading initial ram disk

>

> then a list of checks

>

> [ 0.049346] DMAR-IR:[Firmware Bug] : ioapic 2 has no mappin iommu,

> interrupt remapping will be disabled

> /dev/sda2: clean, 348430/7118848 files, 7186186/28466432 blocks

> [ 3.895353] sd 6:0:0:0: [sdb] No Caching mode page found

> [ 3.895361] sd 6:0:0:0: [sdb] Assuming drive cache: write trhough

> [FAILED] Failed to start Network Manager Wait Online.

> See "systemctl status NetwrokManager-wait-online.service" for details.

> then a list of things starting all [OK]

>

> and then nothing happens

>

> Switching the machine off and re-starting it into the advance option i

> get some root access and i see al my files.I am not able to connect to the internet

> When trying to do something like apt-get update

> the system returns that a shared library libapt-pkg.so.4.12 is not

> installed.

> but I have no internet access so I cannot either find the lib or install

> it. And so I cannot update the system and it feels like a catch 22

> I could really do with some help

I don"t know, but maybe I can help with the network, do an "#ifconfig

-a" to get the name of your interface and then "#ifconfig

(name-of-interface) up" and see if that helps get things going.

I suspect this has to do with the settings of systemd trying to bring a

functional network up before it completes the sequence, but as it is

set to give up at a point it finds yet a different place to get stuck.

I remember a while I had found where to set the time limit but didn't

record the find and while on wifi I have to deal with this delayed booting

myself.

But, on the above problem out of curiosity I found this piece that may

be helpful.  https://ubuntuforums.org/showthread.php?t=2254677

It seems on such machines the interrupts get all twisted and tangled

up.  Quote from the link: 

"The ivrs table is wrong, it points to non existant IOAPIC[0] and IOAPIC[255], so to override this i use this commandline in grub:

ivrs_ioapic[7]=00:14.0 ivrs_ioapic[8]=00:00.1."