{"id":6938,"date":"2026-01-02T11:25:58","date_gmt":"2026-01-02T19:25:58","guid":{"rendered":"https:\/\/wonghoi.humgar.com\/blog\/?p=6938"},"modified":"2026-01-02T11:26:00","modified_gmt":"2026-01-02T19:26:00","slug":"hyper-vs-trouble-with-lightdm-login-display-manager","status":"publish","type":"post","link":"https:\/\/wonghoi.humgar.com\/blog\/2026\/01\/02\/hyper-vs-trouble-with-lightdm-login-display-manager\/","title":{"rendered":"Hyper-V’s trouble with lightdm login display manager"},"content":{"rendered":"\n

Debian 13’s lightdm<\/code> does not work out of the box with the default settings when creating a VM in Hyper-V. I got a black screen if I deviated from gdm<\/code> that only works for GNOME (default), which means no Cinnamon for me.<\/p>\n\n\n\n

With the same Hyper-V setup, Cinnamon\/Lightdm does not work on Ubuntu 25.10 either.<\/p>\n\n\n\n

Turns out lightdm<\/code> requires the Hyper-V VM created as 2nd Generation<\/a>, which uses UEFI instead of BIOS. It beats me why gdm<\/code> is do not need UEFI while lightdm<\/code> does. Not cool!<\/p>\n\n\n\n

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Generation 2 VM is another can of worms. The default secure boot uses the Windows Template. Debian\/Ubuntu CD boots with “Microsoft UEFI Certificate Authority<\/strong>” or no Secure Boot (but you’ll still have to make the installed Debian run with Secure Boot later). Windows and “Open Source Shielded VM” templates are no go for Debian\/Ubuntu.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

If you started the Debian installer CD with Secure Boot disabled, Debian installer will ask if you want to install it as a UEFI enabled OS. You should answer yes and enable secure boot after it finished installing and before rebooting.<\/p>\n

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Debian 13’s lightdm does not work out of the box with the default settings when creating a VM in Hyper-V. I got a black screen if I deviated from gdm that only works for GNOME (default), which means no Cinnamon … Continue reading →<\/span><\/a><\/p>\n

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