Soo's questions

We have created an offline Ubuntu 20.04 repository using apt-mirror as per the directions given in https://www.linuxtechi.com/setup-local-apt-repository-server-ubuntu/

In a few local machines we were able to install packages using apt from the offline repository. But in some other machines, while using the command "sudo apt-get update", it is giving an error "File has unexpected size (1536 != 1260)". Please refer to the following image. It seems like an error related to cnf. We found that the file in the repository has a size 1536. We checked Internet and found that the file has size 1536 only.

How to solve this issue? We are also wondering why the same issue is not reported in other machines? (All machines have Ubuntu 20.04.3)

Recently I used apt-mirror to download Ubuntu 20.04 repository to use it on a local network. When I try to upgrade the packages using the repository I downloaded, I am getting the following error (screenshot attached)

Failed to fetch http://192.168.129.221/ubuntuRepo/pool/multiverse/v/virtualbox-guest-additions-iso/virtualbox-guest-additions-iso_6.1.22-1~ubuntu1.20.04.1_all.deb File has unexpected size (6673520 != 44790436). Mirror sync in progress? [IP: 192.168.129.221 80]

I tried multiple times to download it through "apt-mirror", but couldn't succeed. I also tried to locate the file in Internet and manually replace it. But surprisingly, I couldn't locate the file.

Please let me know how to get rid of this error!

I used to work with Windows 10 guest OS in Ubuntu host machines using Virtualbox. Recently I bought a ASUS Zenbook (UX325EA-EG701TS). I installed Ubuntu 20.04.2 LTS on it and installed Virtualbox 6.1. I tried to install Windows 10 as guest OS, multiple times using different ISO files. But every time it fails. Sometimes it fails during installation and some times during post installation, while configuring the keyboard etc. I am not sure how to get the log messages so that I can identify the reason and possibly rectify it. Any help is appreciated.

Recently I installed Ubuntu 20.04 on my Dektop machine. Though I am getting a display resolution 1920x1080, there seems to be some issue with the display driver. The fonts are not very clear, showing the staircase effect. .

The command sudo lshw -c video gave the following results.

display description: VGA compatible controller
   product: 8th Gen Core Processor Gaussian Mixture Model
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 00
   width: 64 bits
   clock: 33MHz
   capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
   configuration: driver=i915 latency=0
   resources: irq:127 memory:a0000000-a0ffffff memory:90000000-9fffffff ioport:4000(size=64) memory:c0000-dffff

I have tried the solution discussed here. But could not get any improvement. How can I install the proper driver so that I can get a smooth display?

One of my servers running Ubuntu 16.04 (64bit) failed to start due to some bad blocks in the hard disk. Some how I could copy the data. I was running a wordpress blog on this server. Now how can I restore my blog on a new server running Ubuntu 18.04 using the recovered data? Simply copying the folder didn't work...it shows the error message "Error establishing a database connection". I used MySQL as database.

It seems like in Ubuntu 18.04, the default shipped g++ (version 7.3.0) runs in C++11 compatible mode by default. I am getting some errors in my old codes which are not C++11 compatible. I installed g++-6 (version 6.4.0) and the programs are compiling fine. Is it possible to disable C++11 mode in g++-7?

I am trying to install StarUML 2.8 from the here in Ubuntu 18.04 LTS. The package requires "libcurl3". When I install it, it removes the packages "cmake" and "libcurl4". How can I install StarUML (2.8) without removing cmake?

I have installed Gitlab CE on my Ubuntu 18.04 machine and it is working fine. Now I would like to host some more webpages (not related to Git) on the same machine. Since Gitlab is already using a webserver I thought of reusing it. Which webserver is used by Gitlab EE for the default installation? How can I add more webpages to the same webserver?

I thought nginx will be webserver, but could not locate the directory!

I would like to create a local repo for Ubuntu 18.04 and 16.04. I am interested in downloading only 64-bit packages. I am using "apt-mirror" to download the packages to the hard disk.

I use the following in my "mirror.lst"

deb [arch=amd64] http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu xenial-proposed main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse

deb [arch=amd64] http://archive.ubuntu.com/ubuntu bionic main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu bionic-security main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu bionic-updates main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu bionic-proposed main restricted universe multiverse
deb [arch=amd64] http://archive.ubuntu.com/ubuntu bionic-backports main restricted universe multiverse

I got the following error while using "sudo apt-mirror"

Downloading 380 index files using 40 threads...
Begin time: Tue May 22 12:09:11 2018
[40]... [39]... [38]... [37]... [36]... [35]... [34]... [33]... [32]... [31]... [30]... [29]... [28]... [27]... [26]... [25]... [24]... [23]... [22]... [21]... [20]... [19]... [18]... [17]... [16]... [15]... [14]... [13]... [12]... [11]... [10]... [9]... [8]... [7]... [6]... [5]... [4]... [3]... [2]... [1]... [0]... 
End time: Tue May 22 12:09:26 2018

Processing translation indexes: [TTTTTTTTTT]

Downloading 453 translation files using 40 threads...
Begin time: Tue May 22 12:09:26 2018
[40]... [39]... [38]... [37]... [36]... [35]... [34]... [33]... [32]... [31]... [30]... [29]... [28]... [27]... [26]... [25]... [24]... [23]... [22]... [21]... [20]... [19]... [18]... [17]... [16]... [15]... [14]... [13]... [12]... [11]... [10]... [9]... [8]... [7]... [6]... [5]... [4]... [3]... [2]... [1]... [0]... 
End time: Tue May 22 12:10:03 2018

Processing DEP-11 indexes: [DDDDDDDDDD]

Downloading 144 dep11 files using 40 threads...
Begin time: Tue May 22 12:10:03 2018
[40]... [39]... [38]... [37]... [36]... [35]... [34]... [33]... [32]... [31]... [30]... [29]... [28]... [27]... [26]... [25]... [24]... [23]... [22]... [21]... [20]... [19]... [18]... [17]... [16]... [15]... [14]... [13]... [12]... [11]... [10]... [9]... [8]... [7]... [6]... [5]... [4]... [3]... [2]... [1]... [0]... 
End time: Tue May 22 12:13:42 2018

Processing indexes: [P
gzip: stdin: not in gzip format

gzip: stdin: not in gzip format

gzip: stdin: not in gzip format

gzip: stdin: not in gzip format
PPPPP
gzip: stdin: not in gzip format

gzip: stdin: not in gzip format

gzip: stdin: not in gzip format

gzip: stdin: not in gzip format
PPPP
gzip: stdin: not in gzip format

gzip: stdin: not in gzip format

gzip: stdin: not in gzip format

gzip: stdin: not in gzip format
]

26.9 GiB will be downloaded into archive.
Downloading 5640 archive files using 40 threads...
Begin time: Tue May 22 12:13:43 2018
[40]... [39]... [38]... [37]... [36]... [35]... [34]... [33]... [32]... [31]... [30]... [29]... [28]... [27]... [26]... [25]... [24]... [23]... [22]... [21]... [20]... [19]... [18]... [17]... [16]... [15]... [14]... [13]... [12]... [11]... [10]... [9]... [8]... [7]... [6]... [5]... [4]... [3]... [2]... [1]... 


[0]... 
End time: Tue May 22 12:58:01 2018

I tried many times repeatedly and getting the same error every time.

The download is also very slow (despite of my fast Internet connection). Is there any option to download the packages simultaneously from multiple mirrors? Also please let me know any solution to overcome the error!

I have installed Ubuntu 16.04 on my Apple MacBook Air (2015). The two major problems I face issue with Battery Backup.

The battery backup has been significantly reduced to 2-3 hours. The OsX was comfortably giving me 7-8 hours backup. Another strange thing I noticed is that, even if put my laptop on sleep mode (with full charge), the battery becomes empty after a couple of hours. It seems some applications wakes up frequently and consume the power. Do we have any application which will show the battery consumption for a long time, for example for lat 24 hours (or during a full discharge cycle)? I found powertop, but it gives only the statistics when the system is on (not sleep).