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I have the same problem as here. Nothing from answers helped. I tried http://youtu.be/5_fluJuJc6E?t=58 but Remove Attachment is grayed out. I have VirtualBox 6.1 and Lubuntu 18.04.

sancho.s ReinstateMonicaCellio
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xralf
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    FYI: Lubuntu 18.04 LTS is no longer supported; refer https://lubuntu.me/bionic-eol/ or https://fridge.ubuntu.com/2020/08/14/ubuntu-18-04-5-lts-released/ where you'll note only Ubuntu Server, Ubuntu Desktop & Ubuntu Cloud come with 5 years of support; flavors only had shorter lives. I'd suggest using ubuntu-support-status to assess the security status of your actual install. Your question is still on-topic here, but consider how much security matters to you and the results of prior command. You're now using Ubuntu 18.04 LTS with LXDE (not Lubuntu). – guiverc Nov 15 '21 at 07:16
  • @guiverc Thank you. Actually, this is Lubuntu. You probably remembered another question, where I installed Ubuntu with LXDE to my coworker. This is another case. Lubuntu 18.04 in virtual machine where I run mainly apache. Do you recommend me some upgrade? I don't know the shortest command sequence for upgrade to newer version. :-) so I'm not upgrading so far. – xralf Nov 15 '21 at 07:35
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    I'm not sure I recommended anyone installing Lubuntu 18.04 LTS unless the box was i386 or 32-bit as it was the end of the road (technically 18.10 & 19.04 were supported for i386 but ended life before 18.04 LTS did/does). Lubuntu 18.04 LTS being the end of the road for upgrades; other flavors usually made more sense, unless the user was capable enough to fix their own issues. (I don't usually remember many users, as I see 30-80 support questions per day; unless it's the same identical question asked on multiple sites; those stand out) – guiverc Nov 15 '21 at 07:44

1 Answers1

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This answer helped.

sudo mount -o loop /tmp/VBoxGuestAdditions_6.1.26.iso /mnt

and

sudo sh /mnt/VBoxLinuxAdditions.run
xralf
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