{"id":149,"date":"2014-02-03T10:50:10","date_gmt":"2014-02-03T10:50:10","guid":{"rendered":"http:\/\/queen.run.montefiore.ulg.ac.be\/~barbette\/?p=149"},"modified":"2014-02-03T11:03:03","modified_gmt":"2014-02-03T11:03:03","slug":"how-to-debug-at-boot-time","status":"publish","type":"post","link":"https:\/\/perso.uclouvain.be\/tom.barbette\/how-to-debug-at-boot-time\/","title":{"rendered":"How to debug at boot time"},"content":{"rendered":"<p>If all you get is a black screen when booting, boot in recovery mode to see a little more information :<\/p>\n<p><a href=\"https:\/\/www.tombarbette.be\/wp-content\/uploads\/2014\/02\/recovery.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-150\" alt=\"recovery\" src=\"https:\/\/www.tombarbette.be\/wp-content\/uploads\/2014\/02\/recovery-300x225.png\" width=\"300\" height=\"225\" srcset=\"https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery-300x225.png 300w, https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery-1024x771.png 1024w, https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery-160x120.png 160w, https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery.png 1077w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>When you are in the grub menu, choose the \u201crecovery\u201d version<\/p>\n<p>If there is none or if it\u2019s still black type \u201ce\u201d in the grub menu over the kernel entry you want. Find the line starting by linux, and add \u201cro single recovery\u201d at the end.<br \/>\nType F10 to boot.<\/p>\n<p><a href=\"https:\/\/www.tombarbette.be\/wp-content\/uploads\/2014\/02\/recovery2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-151\" alt=\"recovery2\" src=\"https:\/\/www.tombarbette.be\/wp-content\/uploads\/2014\/02\/recovery2-300x227.png\" width=\"300\" height=\"227\" srcset=\"https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery2-300x227.png 300w, https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery2-1024x776.png 1024w, https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery2-160x120.png 160w, https:\/\/perso.uclouvain.be\/tom.barbette\/wp-content\/uploads\/2014\/02\/recovery2.png 1078w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Grub normally have a \u201cPrevious versions\u201d menu to allow you to boot with the ubuntu default kernel&#8230;<\/p>\n<p>&nbsp;<\/p>\n<p>In fact if you get a black screen when booting, chances is that you&#8217;re missing some modules. But you can get more:<\/p>\n<ul>\n<li>Add a serial device to your virtualbox, select &#8220;file&#8221; mode, with e.g. \/tmp\/vbox-jerry<\/li>\n<li>run tail -f \/tmp\/vbox-jerry on your machine to watch that log file,<\/li>\n<li>before booting, press e to edit the config and add at the tail of the command line &#8221; console=ttyS0,57600&#8243;<\/li>\n<li>this will work only for boot time, when syslogd will start, the log will go to \/var\/log\/syslog<\/li>\n<li>You can use the \/etc\/default\/grub file like for the screen size (see slides of info0940) to make it permanent<\/li>\n<\/ul>\n<p><strong><span style=\"color:red\">A network problem during boot may stall you for 120 seconds, with or without a black screen ! So wait a little !<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If all you get is a black screen when booting, boot in recovery mode to see a little more information : When you are in the grub menu, choose the \u201crecovery\u201d version If there is none or if it\u2019s still black type \u201ce\u201d in the grub menu over the kernel entry you want. Find the &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/perso.uclouvain.be\/tom.barbette\/how-to-debug-at-boot-time\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;How to debug at boot time&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,16],"tags":[36,37,4,5,35],"class_list":["post-149","post","type-post","status-publish","format-standard","hentry","category-os","category-unix","tag-boot","tag-debug","tag-info0940","tag-kernel","tag-os-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to debug at boot time - Tom Barbette<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/perso.uclouvain.be\/tom.barbette\/how-to-debug-at-boot-time\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to debug at boot time - Tom Barbette\" \/>\n<meta property=\"og:description\" content=\"If all you get is a black screen when booting, boot in recovery mode to see a little more information : When you are in the grub menu, choose the \u201crecovery\u201d version If there is none or if it\u2019s still black type \u201ce\u201d in the grub menu over the kernel entry you want. 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