Soha Mukerji

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When it comes to displaying managers, we have several options to choose from, in the Linux world. They are –

In this article, we are going to take a look at the differences between Gnome Display Manager (GDM) and LightDM and help you pick the right one for you.

Well, ideally, you really shouldn’t use any other Display Manager than the one which is shipped with your desktop environment as default. GDM has many dependencies which are used by other components of the GNOME desktop environment, and the same is also true for LightDM.

So unless you are using a window manager like i3WM, i3-gaps, or Sway, or you are changing the Desktop Environments on your system, you shouldn’t hop between Display Managers. But here’s a small comparison of both Window Managers anyway :

This is the default Display Manager in GNOME, and if GNOME is pre-installed on your distribution, then you’re also probably using this without your knowledge. It is on the heavier side of the display managers, but you’re probably fine with it as you are using GNOME, which is heavy on system resources.

If you are considering using GNOME on old hardware, then I don’t think this display manager will be the right choice for you. It comes pre-installed in many distributions such as Ubuntu, Garuda Linux, Manjaro, Pop_OS! (this will likely change in the future as devs are migrating towards a Rust-based COSMIC Desktop Environment). Some notable features of this Display Manager are:

The Installation is really easy, we just have to install it using our package manager on the Terminal :

For Ubuntu and Ubuntu-based distributions :

For Arch Linux and Arch-based distributions :

For Fedora Workstation :

Now, we have to enable the GDM service so that it starts on our system startup :

This Display Manager is designed to be simple, fast, secure, and flexible. And it even supports multiple desktop environments. The developers have kept the source code really simple. Notable Features of LightDM are :

To install LightDM on your operating system, use these commands, depending upon your Operating System :

For Ubuntu-based distributions :

For Arch Linux and Arch-based distributions :

And for Fedora Workstation, type :

To enable LightDM to run on system startup, enable this service :

If you’re using the GNOME desktop environment, then it is highly recommended to use GDM to avoid any dependency-related issues. For any other Desktop Environment, you can choose to use LightDM without any issues. LightDM also has some issue with the NVIDIA drivers and sometimes auto-login doesn’t work on it. But it’s safe to use if you don’t use those features as auto-login poses a security issue and therefore is not recommended.

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Many countries have completely lifted their Covid-related restrictions, which means no more need for testing before travel or even proof that you’ve been fully vaccinated. But there are plenty of destinations where testing is still a requirement, especially for those who are unvaccinated. Even on cruise ships, where restrictions are slowly being relaxed, testing before boarding is still required in many cases.

So if you need to get a Covid test with a fit-to-fly certificate before you travel, where can you go without spending a fortune? Here’s what you need to know.

Main photo: coronavirus testing centre at London Heathrow (Alamy)

Many destinations have dropped testing requirements for travellers who are fully vaccinated, while some have dropped their travel restrictions altogether. However, for places where testing is still a requirement, the rules now vary enormously so do check the relevant destination page on the Foreign Office website to get all of the details.

In particular, look out for the type of test (PCR or lateral flow), whether it can be administered remotely or must be done in person and by a professional, and when you need to get the test done. Lateral flow tests usually need to be administered closer to the departure time than a PCR test.

When testing prior to travel is required, a fit-to-fly certificate will be needed. This is a certificate that outlines your details, when the testing was done and the results. It should also include details of the testing provider and the accuracy of the test.

Even if countries don’t require fit-to-fly tests, they may ask for health forms to be completed. Check Foreign Office advice for the latest information, as well as the website of the destination country’s health department and tourist board.

If all of this seems daunting and confusing, and you are travelling on a package holiday, ask your tour operator to help; these days most have specialist staff on their team.

You cannot use any NHS-provided Covid tests for travel; Covid tests for travel must be administered by private providers who meet the relevant standards, and who will issue a fit-to-fly certificate. Double check the rules for the destination you’re travelling to — some may have set out specific testing requirements or have a list of providers they will accept.

Once you are overseas, the NHS proof of vaccine status, either printed out or downloaded via the NHS app, can be invaluable for gaining entry to hotels, restaurants and even museums.

The easiest way to book is to visit the website of the testing provider you’re going with and choose the date and time that works best for you. Some may also have phone numbers that you can call, or allow walk-ins.

You’ll need to work backwards from your departure time to find when the test needs to be administered — double check that your test provider is able to get your test results back in time. Most are now able to return results within 24 hours.

You can book a test using one of the government-approved test providers, or find one on the Covid Testing Network. Private providers come in two main types: those who offer an in-person swab test (quicker but more expensive), and those who send out test kits for the user to self-administer (more affordable but potentially slower). Double check which your destination will accept.

Examples of the former are Boots and Express Test which use pharmacies as test centres; Prenetics and Randox supply tests that can be done at home.

The cost of PCR tests have dropped significantly since the early days of the pandemic, with prices now starting from around £40. However, if you need a last-minute test, or if your test is done in person, it will usually cost more. Prices can also vary depending on the location of your test centre, even if the testing provider is the same.

Lots of testing centres offer same-day results, but you’ll usually need to book ahead. If you need a last-minute test, your best bet is to check availability at airport testing centres or call your nearest providers.

The UK government has a list of accredited Covid-test providers here. However, the destination you’re travelling to may have a different list so make sure you check that the provider you intend to use is approved by them as well.

The single biggest pitfall is timing: either arranging your pre-departure test too late — or too early. Allow plenty of time; different destinations set different validity times on testing, with most at 48 or 72 hours. But that countdown starts from the moment of being swabbed, not from the receipt of the lab result. Moreover, some destinations require the tests to be valid right up to the traveller’s arrival in the country, and not just to the time when you board the plane, which may mean testing during a stopover.

As for the home-test system, there are two key flaws. First, it depends on a reliable postal service to deliver the sample to the lab, which can be tricky if you’re depending on it to get on a flight. Second, there’s no guarantee that the sample comes from the actual traveller, which is why some countries insist on in-person testing.

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