[SOLVED] Unable to ping after trashing /usr and /var permissions

Lorec · 2023-09-28 08:46:28

I am obviously pretty new to having a [usable] Linux machine, as I recently

- recursively assigned /usr to root
- recursively assigned /var to root
- recursively chmodded /usr as 0775 [I reset the uid bit on /usr/bin/sudo so sudo now works at least]

in an attempt to fix a SQLITE_CANTOPEN error [that turned out to be unrelated to permissions anyway].

And now - both as user and, as far as I've checked, as root -

- nmtui shows no networks
- I can connect to wi-fi with wpa_supplicant but ping gives me

ping: google.com: Temporary failure in name resolution

after I am connected
- nmcli shows my wi-fi interface as "unmanaged" and gives a red warning: "plugin missing"
- iwctl works as usual - the problem is, my usual network requires a password. I could go find an unsecured one but at this point I'm sceptical I'd be able to ping in that case anyway

I know I probably need a reinstall at this point - the problem is, I need to at least use my current install to get the Arch image off the internet again [I am posting this from my phone, which does not have a USB port], because my old bootable USB does not show up in the boot menu after lots of fiddling with boot settings. I think I might have overwritten that bootable while doing the current install, possibly by formatting it as one of two devices listed during the mount phase.

Are there any obvious places a temporary patch here could fix Internet access [as measured by ping working]?

Alternatively, is it utterly impossible that I overwrote the bootable during install, such that I should just be trying to get *that* working instead?

Thanks in advance.

Last edited by Lorec (2023-10-01 02:41:50)

seth · 2023-09-28 09:25:42

`ping` doesn't work after I am connected

Please don't paraphrase, https://bbs.archlinux.org/viewtopic.php?id=57855

ping -c1 localhost
ping -c1 _gateway
ping -c1 8.8.8.8
sudo ping -c1 localhost # though this [url=https://www.youtube.com/watch?v=5RyYrs5tu60]"should" …[/url] not be an issue, ICMP is open
ip a; ip r

I know I probably need a reinstall at this point

You only need to re-install all packages

- I can connect to wi-fi with wpa_supplicant but `ping` doesn't work after I am connected
- `nmcli` shows my wi-fi interface as "unmanaged" and gives a red warning: "plugin missing"
- `iwctl` works as usual - the problem is, my usual network requires a password. I could go find an unsecured one but at this point I'm sceptical I'd be able to ping in that case anyway

You must not use wpa_supplicant and iwd concurrently (on the same NIC)

Lorec · 2023-09-28 09:49:55

Toppost updated with the error message I receive when attempting ping after connecting via wpa_cli -

ping: google.com: Temporary failure in name resolution

I have tried connecting with wpa_cli after confirming that iwd is not running by trying to start iwctl and receiving `Waiting for iwd to start . . . `, and the result is the same.

iw dev wlan0 link

Connected to fe:24:4e:bb:93:ef (on wlan0)
SSID: Emerald
freq: 5745
RX: 8719 bytes (54 packets)
TX: 1139 bytes (12 packets)
signal: -50 dBm
rx bitrate: 6.0 MBit/s
tx bitrate: 960.7 MBit/s 80MHz HE-MCS 9 HE-NSS 2 HE-GI 0 HE-DCM 0

bss flags: short-slot-time
dtim period: 1
beacon int: 100

Thank you for the info about package reinstall, that simplifies things greatly.

Last edited by Lorec (2023-09-30 01:27:59)

seth · 2023-09-28 12:49:48

Please use [code][/code] tags. Edit your post in this regard.
Then post the outputs for the commands I posted, not some random stuff.

Though chances are already good that this is a mere DNS issue and eg. "ping 8.8.8.8" works.
Howeve wpa_supplicant only establishes a carrier, it won't provide you with a lease.

Awebb · 2023-09-28 13:40:57

Last time I tried it, this seemed to work reasonably well: https://github.com/droserasprout/pacman-fix-permissions

Lorec · 2023-09-30 01:31:05

Outputs to the commands you [seth] posted:

$ ping -c1 localhost

PING localhost(localhost (::1)) 56 data bytes
64 bytes from localhost (::1): icmp_seq=1 tt1=67 time=0.031 ms

--- localhost ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.031/0.031/0.031/0.000 ma

$ ping -c1 _gateway

PING _gateway(_gateway (fe80::dcb5:4fff:fedb:164%wlan0)) 5 data bytes
64 bytes from _gateway (fe80::dcb5:4fff:fedb:1664%wlan0): icmp_seq=1 tt1=255 time=25.9 ms

___ _gateway ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 25.944/25.944/25.944/0.000 ms


$ ping -c1 8.8.8.8

ping: connect: Network is unreachable


$ sudo ping -c1 localhost

PING localhost(localhost(::1)) 56 data bytes
64 bytes from localhost (::1): icmp_seq=1 tt1=64 time=0.028 ms

--- localhost ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.028/0.028/0.028/0.000 ms

Last edited by Lorec (2023-09-30 01:31:34)

seth · 2023-09-30 05:58:50

ping works but you don't have a functional network configuration, though apparently a carrier.

I can connect to wi-fi with wpa_supplicant but ping gives me

wpa_supplicant only provides you w/ that, you'll still have to run dhcpcd or so to get a lease (or configure a static lease or have wpa_supplicant actually being invoked by NetworkManager etcetc - depending on how you originally set up your network)

Lorec · 2023-09-30 09:26:05

Thanks. I do not have dhcpcd installed. I believe NetworkManager was originally handling my DHCP.

Last edited by Lorec (2023-09-30 09:37:43)

seth · 2023-09-30 13:04:38

And what happens when you start the NM service?
What's its status?
Can you talk to it via GUI applet or nmcli?

Lorec · 2023-09-30 20:16:23

GUI applet opens, but when I click 'Activate a connection', no networks show.

nmcli gives me

wlan0: unmanaged
  "MEDIATEK MT7921 802.11ax"
  wifi (mt7921e), 1:D4:2:1C:1E:B5, plugin missing, hw, mtu 1500

for my wi-fi interface.

Last edited by Lorec (2023-09-30 20:16:50)

seth · 2023-09-30 20:34:15

Did you stop wpa_supplicant before that?

If yes, please post your complete system journal for the boot:

sudo journalctl -b > /tmp/journal.txt

Then usb-walk the file to a system w/ internet access and upload it to eg 0x0.st or wherever you can.

Lorec · 2023-10-01 02:24:45

Thank you - I did not then-currently have a system with Internet connectivity and USB ports but I searched the system journal for NetworkManager, saw these lines -

Sep 30 18:56:16 <computer name> NetworkManager[499]: <info> [1696118176.0593] plugin: skip invalid file /usr/lib/NetworkManager/1.44.0-1/libnm-device-plugin-team.so: file has invalid permissions
Sep 30 18:56:16 <computer name> NetworkManager[499]: <info> [1696118176.0593] plugin: skip invalid file /usr/lib/NetworkManager/1.44.0-1/libnm-device-plugin-adsl.so: file has invalid permissions
Sep 30 18:56:16 <computer name> NetworkManager[499]: <info> [1696118176.0593] plugin: skip invalid file /usr/lib/NetworkManager/1.44.0-1/libnm-device-plugin-wwan.so: file has invalid permissions
Sep 30 18:56:16 <computer name> NetworkManager[499]: <info> [1696118176.0593] plugin: skip invalid file /usr/lib/NetworkManager/1.44.0-1/libnm-device-plugin-bluetooth.so: file has invalid permissions
Sep 30 18:56:16 <computer name> NetworkManager[499]: <info> [1696118176.0593] plugin: skip invalid file /usr/lib/NetworkManager/1.44.0-1/libnm-device-plugin-ovs.so: file has invalid permissions
Sep 30 18:56:16 <computer name> NetworkManager[499]: <info> [1696118176.0593] plugin: skip invalid file /usr/lib/NetworkManager/1.44.0-1/libnm-device-plugin-wifi.so: file has invalid permissions

I tried changing the permissions on all these .so files and restarting NetworkManager a couple times. After chmodding all these .so files to 744, nmtui works as usual and I am posting this from my Arch install.

Arch Linux

#1 2023-09-28 08:46:28

[SOLVED] Unable to ping after trashing /usr and /var permissions

#2 2023-09-28 09:25:42

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#3 2023-09-28 09:49:55

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#4 2023-09-28 12:49:48

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#5 2023-09-28 13:40:57

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#6 2023-09-30 01:31:05

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#7 2023-09-30 05:58:50

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#8 2023-09-30 09:26:05

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#9 2023-09-30 13:04:38

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#10 2023-09-30 20:16:23

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#11 2023-09-30 20:34:15

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

#12 2023-10-01 02:24:45

Re: [SOLVED] Unable to ping after trashing /usr and /var permissions

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