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Sirajus Salekin's questions

Martin Hope
Sirajus Salekin
Asked: 2020-09-07 22:52:18 +0800 CST
  • 0

On Ubuntu 20.04, the terminal doesn't seem to recognize the *regex.

Example, on 18.04 and other prior releases I could just typed and entered

sudo apt install ubuntu-restricted*

and it would automatically pick both ubuntu-restricted-extras and ubuntu-restricted-addons package.

But, on 20.04 it seems to throw an error saying

can't find package ubuntu-restricted*

Is there anyway to get the previous behavior on terminal back?

command-line apt wildcards 20.04
Martin Hope
Sirajus Salekin
Asked: 2018-06-09 19:25:23 +0800 CST
  • 4

Ubuntu 18, trying to make zram to use lz4 compression.

Tried modifying /usr/bin/init-zram-swapping file

#!/bin/sh
...........
...........
for i in $(seq ${NRDEVICES}); do
  DEVNUMBER=$((i - 1))
  echo $mem > /sys/block/zram${DEVNUMBER}/disksize
  echo lz4 > /sys/block/zram${DEVNUMBER}/comp_algorithm # <= added this line
  mkswap /dev/zram${DEVNUMBER}
  swapon -p 5 /dev/zram${DEVNUMBER}
done

But, after rebootzramctl still shows I'm using lzo algortihm

NAME       ALGORITHM DISKSIZE  DATA  COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram3 lzo           466M  2.9M 614.2K    1M       4 [SWAP]
/dev/zram2 lzo           466M  2.9M 631.2K    1M       4 [SWAP]
/dev/zram1 lzo           466M  2.9M 536.1K 1020K       4 [SWAP]
/dev/zram0 lzo           466M    3M   610K    1M       4 [SWAP]

I also tried adding adding it inrc.local, but it throws device already in use warning, because as far as I know, the change needs to be done before mkswap and swapon runs.

swap compression zram
Martin Hope
Sirajus Salekin
Asked: 2017-03-04 07:44:46 +0800 CST
  • 0

I need to reinstall Ubuntu but keep ./Downloads, ./Documents folders of previous installation.

Everything else needs to be in pristine condition like first time installation

that means no .gitconfig, .gitignore, .gemrc, .npmrc, .bashrc, .bash_profile, and other settings file and previous installed apps, files or folders except ./Downloads and .Documents.

Removing these files manually looks a bit tedious, Is there any better way?

I tried the solutions provided here and here but that solution keeps the home folder intact, thus keeping many unnecessary files/folders from previous installation.

My disk structure is: enter image description here

reinstall
Martin Hope
Sirajus Salekin
Asked: 2017-01-29 02:46:08 +0800 CST
  • 6

I'm trying to enable LZ4 compression for zswap on Ubuntu 16.04.1 LTS.

My GRUB config:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash elevator=cfq profile zswap.enabled=1 zswap.compressor=lz4 zswap.max_pool_percent=80"

I executed sudo update-grub, and rebooted. But, zswap says compressor lz4 not available, using default lzo. I have liblz4-tool installed. This is the message I get after executing dmesg | grep zswap

[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-59-generic.efi.signed root=UUID=148a9e6d-52db-4678-b11d-ef1e5559b69d ro quiet splash elevator=cfq profile zswap.enabled=1 zswap.compressor=lz4 zswap.max_pool_percent=80 vt.handoff=7
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.4.0-59-generic.efi.signed root=UUID=148a9e6d-52db-4678-b11d-ef1e5559b69d ro quiet splash elevator=cfq profile zswap.enabled=1 zswap.compressor=lz4 zswap.max_pool_percent=80 vt.handoff=7
[    0.716485] zswap: compressor lz4 not available, using default lzo
[    0.716493] zswap: loaded using pool lzo/zbud
16.04