Which FLUSH command before taking EBS volume snapshot?

The FLUSH TABLES WITH... command has a few flavors. The manual meagerly describes the differences between:

  • FLUSH TABLES WITH READ LOCK
  • FLUSH TABLES WITH READ LOCK AND DISABLE CHECKPOINT
  • FLUSH TABLES … FOR EXPORT

Am I interpreting the manual correctly that if one needs to perform a disk volume snapshot, such as the EBS Snapshot, the preferred way now is to use the FLUSH TABLES WITH READ LOCK AND DISABLE CHECKPOINT right before initiating the snapshot?

sudo update-grub:Sourcing file `/etc/default/grub’ Generating grub configuration file … error: invalid volume

I have re-Installed the Ubuntu after accidentally deleting the Ubuntu partition from windows without proper procedure & configuration of Ubuntu, so in result I couldn’t able to run Ubuntu and cant use the freed space. I have installed the Ubuntu in same partition which I was deleted improperly to overcome this problem, now I can use the Ubuntu but there are some issue.

I am using the dell Inspiron model so i avoid the issue of the kernel checking the graphics driver which causing the boot problem I had to change the some of grub file (Reference Video: https://www.youtube.com/watch?v=Tg4fWsFPzSE). After following the video in last I had to run the sudo update-grub which causing this error. Error after running command

And also there is number other files folder are created because of improper removal of my previous and re installation of Ubuntu again As you can see here

Or should I removed the all Ubuntu now with all configuration and Ubuntu now, will this work?

Any help would be appreciated.

Note: Previous and re-installed version are both Ubuntu is 18.04.3 LTS

Headphone volume is extremely low and noisy

I’m running Ubuntu 19 on my Samsung notbook7 2019 version(NT750XBV-G517A).

I installed windows 10 and ubuntu 19 on this laptop. but when I use a headphone, the sound from the headphone is extremely low (but I can recognize which music is playing) and there is a lot of noise. The thing is there is no problem on windows 10 at all.

I’ve tried reinstalling pavcontrol, alsa, alsamixer, sort of all the solution on the internet about ‘no sound’. but it didn’t work at all.

Here are a sound card and chip information from alsamixer
Card: HDA Intel PCH
Chip: Realtek ALC256

Please help! Thanks you in advance

MountVolume.setup failed for volume “…”: mount failed: exit status 32

My OS is Ubuntu, using openshift, and one pod keep pending, because nfs server cannot be mounted (nfs server is able to be mounted by mannually using command line, but cannot be mounted from the Pod)

I have installed nfs-common, so it’s not the root cause. I trying to install nfs-utils, but I was failed, the error message is:

E: Unable to locate package: nfs-utils.

I also tried libnfs12 and libnfs-utils, they were the same as nfs-utils. I also used apt-get install upgade and update to solve the package locating problem, but they were useless.

I’m going to show the yaml file for connecting the nfs server

apiVersion: v1 kind: PersistentVolume metadata:   name: pv-test01   lables:     disktype: baas spec:   capacity:     storage: 1Gi   accessModes:     - ReadWriteMany   nfs:     path: /baas     server: 9.111.140.47     readOnly: false   persistentVolumeReclaimPolicy: Recycle 

after using “oc describe pod/mypod” for the pending Pod, below is the feedback:

Warning  FailedMount  14s  kubelet, localhost  MountVolume.SetUp failed for volume "pv-test01" : mount failed: exit status 32 Mounting command: systemd-run Mounting arguments: --description=Kubernetes transient mount for /var/lib/origin/cluster-up/root/openshift.local.clusterup/openshift.local.volumes/pods/267db6f2-d875-11e9-80ba-005056bc3ce0/volumes/kubernetes.io~nfs/pv-test01 --scope -- mount -t nfs 9.111.140.47:/baas /var/lib/origin/cluster-up/root/openshift.local.clusterup/openshift.local.volumes/pods/267db6f2-d875-11e9-80ba-005056bc3ce0/volumes/kubernetes.io~nfs/pv-test01 Output: Running scope as unit run-28094.scope. mount: wrong fs type, bad option, bad superblock on 9.111.140.47:/baas,        missing codepage or helper program, or other error        (for several filesystems (e.g. nfs, cifs) you might        need a /sbin/mount.<type> helper program)         In some cases useful info is found in syslog - try        dmesg | tail or so. 

so how can I mount to nfs server from the Pod?

Volume mute or Completely Loud (Sound Bar or volume buttons doesnot respect the sound settings in unbuntu 18/19

I have a audio chipset of realteck ALC295, and the sound volumes are very high or mute

please help me in setting up the volume driver for the os!

(i have shifted from windows 10 to ubuntu since I really fed up with the buggy released of windows 10)

Recalibrate volume control

I’m using an external USB soundcard in Kubuntu and the volume control is almost non-existent.

Running alsamixer, anything up to 34 is just dead-silence, 35 is too soft and 36 is loud, 37 and up is simply too loud that it would probably damage my headphones and ears.

Is there a way to re-calibrate the volume control so that 0-100 covers the 34-36 range?

I’m on Kubuntu 19.04

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How do I increase the volume of file system root

I’m new to Ubuntu and I’ve installed it (Ubuntu 16.04.6) on a partition of my 128GB SSD so that I have a dual boot operating system (windows 10 and Ubuntu). However I keep getting a warning message saying ‘The volume “Filesystem root” has only 82 MB disk space remaining’ and I don’t know how to expand it. I tried expanding the partition ubuntu is installed on while in windows but it wouldn’t let me add any unassigned storage onto the partition containing Ubuntu.

I was wondering increasing the partition size is possible (or if that is even the problem) or if I’m better off creating a new partition in my 1tb HDD and installing it there instead since I can probably only add a few more gb to the SSD ubuntu partition at most.

john@johnubuntu:~$   df -h   Filesystem      Size  Used Avail Use% Mounted on   udev            7.8G     0  7.8G   0% /dev   tmpfs           1.6G  9.5M  1.6G   1% /run   /dev/sda7       8.8G  8.3G   60M 100% /   tmpfs           7.8G  205M  7.6G   3% /dev/shm   tmpfs           5.0M  4.0K  5.0M   1% /run/lock   tmpfs           7.8G     0  7.8G   0% /sys/fs/cgroup   /dev/sda1       496M   69M  428M  14% /boot/efi   tmpfs           1.6G   72K  1.6G   1% /run/user/1000 

Any help would be very much appreciated.

Windows volume to Ubuntu

I’m trying to move my hobby computer from Windows server to Ubuntu. Unfortunately I get stuck when trying to convert my windows disks that is in raid0 to create one big volume to ubuntu. I want the same setup in Ubuntu and tried to follow linuxserver by using mergerfs fuse to do this. Everything is working down to “Create fstab entries” but afterwords I get an error about something called LDM and something about NTFS. Is there any other guide that can explain how to convert the drives from windows?